efy project list.205105631

8/8/2019 EFY Project List.205105631

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www.vivta.co.in

EFY PROJECT LISTJ A N U A R Y 2 0 0 1

Circuit Ideas:

Electronic Starter For Single Phase Motor

Modem On/Off IndicatorPrecision Amplifier With Digital Control

Precision Attenuator With Digital Control

Random Number Generator Based GameTouch Select Audio Source

Constructions:

Automatic Room Light ControllerBuild Your Own Pentium PC -I

F E B R U A R Y 2 0 0 1

Circuit Ideas:

9-Line Telephone Sharer

Electronic Card Lock System

Generation Of 1 Second Pulses spaced 5 sec. ApartHigh/Low Voltage Cutout With Timer

Pulsed Operation Of CW Laser Diode

Constructions:

A Unique Liuid Level Indicator

Build You Own Pentium PC Part II

Intelligent water Level Indicator

M A R C H 2 0 0 1

Circuit Ideas:

AC Mains Phase-Sequence IndicatorAutomatic Heat Detector

Hi-Power Bicycle Horn

Luxurious Toilet/ Bathroom FacilityMusical 'Touch' Bell

Non-Contact Liquid Level Indicator
http://efymagonline.com/showme.asp?id=625&title=Non-Contact%20Liquid%20Level%20Indicator&issue=March2001http://efymagonline.com/showme.asp?id=624&title=Musicalhttp://efymagonline.com/showme.asp?id=623&title=Luxurious%20Toilet/%20Bathroom%20Facility&issue=March2001http://efymagonline.com/showme.asp?id=622&title=Hi-Power%20Bicycle%20Horn&issue=March2001http://efymagonline.com/showme.asp?id=621&title=Automatic%20Heat%20Detector&issue=March2001http://efymagonline.com/showme.asp?id=620&title=AC%20Mains%20Phase-Sequence%20Indicator&issue=March2001http://efymagonline.com/showme.asp?id=639&title=Intelligent%20water%20Level%20Indicator&issue=February2001http://efymagonline.com/showme.asp?id=638&title=Build%20You%20Own%20Pentium%20PC%20Part%20II&issue=February2001http://efymagonline.com/showme.asp?id=640&title=A%20Unique%20Liuid%20Level%20Indicator&issue=February2001http://efymagonline.com/showme.asp?id=644&title=Pulsed%20Operation%20Of%20CW%20Laser%20Diode&issue=February2001http://efymagonline.com/showme.asp?id=643&title=High/Low%20Voltage%20Cutout%20With%20Timer&issue=February2001http://efymagonline.com/showme.asp?id=642&title=Generation%20Of%201%20Second%20Pulses%20spaced%205%20sec.%20Apart&issue=February2001http://efymagonline.com/showme.asp?id=641&title=Electronic%20Card%20Lock%20System&issue=February2001http://efymagonline.com/showme.asp?id=1218&title=9-Line%20Telephone%20Sharer&issue=February2001http://efymagonline.com/showme.asp?id=663&title=Build%20Your%20Own%20Pentium%20PC%20-I&issue=January2001http://efymagonline.com/showme.asp?id=662&title=Automatic%20Room%20Light%20Controller&issue=January2001http://efymagonline.com/showme.asp?id=661&title=Touch%20Select%20Audio%20Source&issue=January2001http://efymagonline.com/showme.asp?id=660&title=Random%20Number%20Generator%20Based%20Game&issue=January2001http://efymagonline.com/showme.asp?id=659&title=Precision%20Attenuator%20With%20Digital%20Control&issue=January2001http://efymagonline.com/showme.asp?id=658&title=Precision%20Amplifier%20With%20Digital%20Control&issue=January2001http://efymagonline.com/showme.asp?id=657&title=Modem%20On/Off%20Indicator&issue=January2001http://efymagonline.com/showme.asp?id=656&title=Electronic%20Starter%20For%20Single%20Phase%20Motor&issue=January2001


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Constructions:

Interface Your Printer With 8085 MicroprocessorMorse Processor

A P R I L 2 0 0 1

Circuit Ideas:Auto Shut-Off For Cassette Players And Amplifiers

EEPROM W27c512 [Winbond] Eraser

House Security SystemIntelligent Electronic Lock

Simple Water-Level Indicator-Cum Alarm

Stable 455KHz BFO FOR SSB Reception

Constructions:

Access Control System

Telephone Line-Interfaced Generic Switching System Part I

M A Y 2 0 0 1Circuit Ideas:15-Step Digital Power Supply

Microphone For Computer

Precision Inductance And Capacitance Meter

Ultra-Sensitive Solid State Clap SwitchUnder-/Over-Voltage Beep For Manual Stabilizer

Constructions:Programmable Melody Generator Part I

Telphone Line-Interface Generic Switching System Part II

J U N E 2 0 0 1

Circuit Ideas:

Automatic Plant Irrigator

DTMF Proximity DetectorHigh-Power Car Battery Eliminator

Low-Cost Intercom

Stepper Motor ControlVersatile Zener Diode

Constructions:

Auto-Control For 3-Phase MotorsProgrammable Melody Generator -Part II

J U L Y 2 0 0 1

Circuit Ideas:Anti-theft Security For Car Audio

Dual-Input High Fedility Audio Mixer
http://efymagonline.com/showme.asp?id=545&title=Dual-Input%20High%20Fedility%20Audio%20Mixer&issue=July2001http://efymagonline.com/showme.asp?id=544&title=Anti-theft%20%20Security%20For%20Car%20Audio&issue=July2001http://efymagonline.com/showme.asp?id=562&title=Programmable%20Melody%20Generator%20-Part%20II&issue=June2001http://efymagonline.com/showme.asp?id=561&title=Auto-Control%20For%203-Phase%20Motors&issue=June2001http://efymagonline.com/showme.asp?id=569&title=Versatile%20Zener%20Diode&issue=June2001http://efymagonline.com/showme.asp?id=568&title=Stepper%20Motor%20Control&issue=June2001http://efymagonline.com/showme.asp?id=567&title=Low-Cost%20Intercom&issue=June2001http://efymagonline.com/showme.asp?id=565&title=High-Power%20Car%20Battery%20Eliminator&issue=June2001http://efymagonline.com/showme.asp?id=564&title=DTMF%20Proximity%20Detector&issue=June2001http://efymagonline.com/showme.asp?id=563&title=Automatic%20Plant%20Irrigator&issue=June2001http://efymagonline.com/showme.asp?id=583&title=Telphone%20Line-Interface%20Generic%20Switching%20System%20Part%20II&issue=May2001http://efymagonline.com/showme.asp?id=582&title=Programmable%20Melody%20Generator%20Part%20I&issue=May2001http://efymagonline.com/showme.asp?id=588&title=Under-/Over-Voltage%20Beep%20For%20Manual%20Stabiliser&issue=May2001http://efymagonline.com/showme.asp?id=587&title=Ultra-Sensitive%20Solid%20State%20Clap%20Switch&issue=May2001http://efymagonline.com/showme.asp?id=586&title=Pecision%20Inductance%20And%20Capacitance%20Meter&issue=May2001http://efymagonline.com/showme.asp?id=585&title=Microphone%20For%20Computer&issue=May2001http://efymagonline.com/showme.asp?id=584&title=15-Step%20Digital%20Power%20Supply&issue=May2001http://efymagonline.com/showme.asp?id=607&title=Telephone%20Line-Interfaced%20Generic%20Switching%20System%20Part%20I&issue=April2001http://efymagonline.com/showme.asp?id=606&title=Access%20Control%20System&issue=April2001http://efymagonline.com/showme.asp?id=605&title=Stable%20455KHz%20BFO%20FOR%20SSB%20Reception&issue=April2001http://efymagonline.com/showme.asp?id=604&title=Simple%20Water-Level%20Indicator-Cum%20Alarm&issue=April2001http://efymagonline.com/showme.asp?id=603&title=Intelligent%20Electronic%20Lock&issue=April2001http://efymagonline.com/showme.asp?id=602&title=House%20Security%20System&issue=April2001http://efymagonline.com/showme.asp?id=601&title=EEPROM%20W27c512%20%5bWinbond%5d%20Eraser&issue=April2001http://efymagonline.com/showme.asp?id=600&title=Auto%20Shut-Off%20For%20Cassette%20Players%20And%20Amplifiers&issue=April2001http://efymagonline.com/showme.asp?id=619&title=Morse%20Processor&issue=March2001http://efymagonline.com/showme.asp?id=618&title=Interface%20Your%20Printer%20With%208085%20Microprocessor&issue=March2001


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N O V E M B E R 2 0 0 1

Circuit Ideas:Active Shortwave Antenna

Dark Room Timer

High Performance Interruption detector

Long Range Target ShooterPower Supply For Walkie-Talkies

Speller Effect Sign Display

Constructions:

Amplitude Measurements Of Sub-Microsecond PulsesAutomatic Submersible Pump Controller

D E C E M B E R 2 0 0 1

Circuit Ideas:

Condenser Mic Audio AmplifierDecorative Signboard

Digital Relay Tester For RAX And MAXFastest Finger First Indicator

Overload Protector With Reset Button

Smoke Alarm

Constructions:

Transistor Curve Tracer

Tripping Sequence Recorder-Cum-Indicator

J A N U A R Y 2 0 0 2

Circuit Ideas:

Digital Die-Cum-Alpha Display TosserHardware Solution For Two Simultaneous Linear Equations

Laser Torch-Based Voice Transmitter And Receiver

Low-Power Broadcast TransmitterMobile Battery Charger

Parallel Telephone With Auto Secrecy And Intercom Facility

Constructions:

A Versatile Programmable Timer

EPROM-Controlled Lighting Effect Generator

F E B R U A R Y 2 0 0 2

Circuit Ideas:

Fan Speed Control By Clapping

FM BoosterHex-To-Analogue Converter

Multitester With Audio-Visual Indicator
http://efymagonline.com/showme.asp?id=418&title=Multitester%20With%20Audio-Visual%20Indicator&issue=February2002http://efymagonline.com/showme.asp?id=416&title=Hex-To-Analogue%20Converter&issue=February2002http://efymagonline.com/showme.asp?id=415&title=FM%20Booster&issue=February2002http://efymagonline.com/showme.asp?id=414&title=Fan%20Speed%20Control%20By%20Clapping&issue=February2002http://efymagonline.com/showme.asp?id=434&title=EPROM-Controlled%20Lighting%20Effect%20Generator&issue=January2002http://efymagonline.com/showme.asp?id=440&title=A%20Versatile%20Programmable%20Timer&issue=January2002http://efymagonline.com/showme.asp?id=439&title=Parallel%20Telephone%20With%20Auto%20Secrecy%20And%20Intercom%20Facility&issue=January2002http://efymagonline.com/showme.asp?id=438&title=Mobile%20Battery%20Charger&issue=January2002http://efymagonline.com/showme.asp?id=437&title=Low-Power%20Broadcast%20Transmitter&issue=January2002http://efymagonline.com/showme.asp?id=436&title=Laser%20Torch-Based%20Voice%20Transmitter%20And%20Receiver&issue=January2002http://efymagonline.com/showme.asp?id=435&title=Hardware%20Solution%20For%20Two%20Simultaneous%20Linear%20Equations&issue=January2002http://efymagonline.com/showme.asp?id=433&title=Digital%20Die-Cum-Alpha%20Display%20Tosser&issue=January2002http://efymagonline.com/showme.asp?id=452&title=Tripping%20Sequence%20Recorder-Cum-Indicator&issue=December2001http://efymagonline.com/showme.asp?id=451&title=Transistor%20Curve%20Tracer&issue=December2001http://efymagonline.com/showme.asp?id=458&title=Smoke%20Alarm&issue=December2001http://efymagonline.com/showme.asp?id=457&title=Overload%20Protector%20With%20Reset%20Button&issue=December2001http://efymagonline.com/showme.asp?id=456&title=Fastest%20Finger%20First%20Indicator&issue=December2001http://efymagonline.com/showme.asp?id=453&title=Digital%20Relay%20Tester%20For%20RAX%20And%20MAX&issue=December2001http://efymagonline.com/showme.asp?id=455&title=Decorative%20Signboard&issue=December2001http://efymagonline.com/showme.asp?id=454&title=Condenser%20Mic%20Audio%20Amplifier&issue=December2001http://efymagonline.com/showme.asp?id=480&title=Automatic%20Submersible%20Pump%20Controller&issue=November2001http://efymagonline.com/showme.asp?id=479&title=Amplitude%20Measurements%20Of%20Sub-Microsecond%20Pulses&issue=November2001http://efymagonline.com/showme.asp?id=474&title=Speller%20Effect%20Sign%20Display&issue=November2001http://efymagonline.com/showme.asp?id=478&title=Power%20Supply%20For%20Walkie-Talkies&issue=November2001http://efymagonline.com/showme.asp?id=477&title=Long%20Range%20Target%20Shooter&issue=November2001http://efymagonline.com/showme.asp?id=476&title=High%20Performance%20Interruption%20detector&issue=November2001http://efymagonline.com/showme.asp?id=475&title=Dark%20Room%20Timer&issue=November2001http://efymagonline.com/showme.asp?id=473&title=Active%20Shortwave%20Antenna&issue=November2001


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Shortwave Transmitter

Three Phase Star-Delta Motor Starter

Constructions:

Make Your Own Automobile Stereo

Two-Wire Remote Control

M A R C H 2 0 0 2

Circuit Ideas:5.5MHz/10.7MHz IF-FM Signal Generator

Ding-Dong Bell

Doctor's SwitchHigh-Power Telephone Extra Ringer

IR Remote Switch

Remote Control Using AC Mains

Constructions

:Make Your Own EPROM Eraser With Electronic Timer

Simple Digital Clock With Hourly Music

A P R I L 2 0 0 2

Circuit Ideas:

8085 Kit-based Relay ControlFM Band Receiver

Infrared Car Parking Guard

Music-on-Hold For TelephoneSolidstate Switch For DC-Operated Gadgets

Constructions:

Digital Flow MeterMultipurpose Absorption Rate Meter For Fabrics

M A Y 2 0 0 2

Circuit Ideas:

40-Metre CW Transmitter

Crystal Controlled Time-Base GeneratorDual-Speed Fan Driver For Heat-Sink

Mains-Operated Christmas Star

Security Alarm For Motor Bikes

Single-Plate Touch Switch

Constructions:

Z-80 based Auto-Ranging LCD Capacitance Meter
http://efymagonline.com/showme.asp?id=359&title=Z-80%20based%20Auto-Ranging%20LCD%20Capacitance%20Meter&issue=May2002http://efymagonline.com/showme.asp?id=358&title=Single-Plate%20Touch%20Switch&issue=May2002http://efymagonline.com/showme.asp?id=356&title=Security%20Alarm%20For%20Motor%20Bikes&issue=May2002http://efymagonline.com/showme.asp?id=355&title=Mains-Operated%20Christmas%20Star&issue=May2002http://efymagonline.com/showme.asp?id=354&title=Dual-Speed%20Fan%20Driver%20For%20Heat-Sink&issue=May2002http://efymagonline.com/showme.asp?id=353&title=Crystal%20Controlled%20Time-Base%20Generator&issue=May2002http://efymagonline.com/showme.asp?id=352&title=40-Metre%20CW%20Transmitter&issue=May2002http://efymagonline.com/showme.asp?id=377&title=Multipurpose%20Absorption%20Rate%20Meter%20For%20Fabrics&issue=April2002http://efymagonline.com/showme.asp?id=374&title=Digital%20Flow%20Meter&issue=April2002http://efymagonline.com/showme.asp?id=379&title=Solidstate%20Switch%20For%20DC-Operated%20Gadgets&issue=April2002http://efymagonline.com/showme.asp?id=378&title=Music-on-Hold%20For%20Telephone&issue=April2002http://efymagonline.com/showme.asp?id=376&title=Infrared%20Car%20Parking%20Guard&issue=April2002http://efymagonline.com/showme.asp?id=375&title=FM%20Band%20Receiver&issue=April2002http://efymagonline.com/showme.asp?id=373&title=8085%20Kit-based%20Relay%20Control&issue=April2002http://efymagonline.com/showme.asp?id=399&title=Simple%20Digital%20Clock%20With%20Hourly%20Music&issue=March2002http://efymagonline.com/showme.asp?id=395&title=Make%20Your%20Own%20EPROM%20Eraser%20With%20Electronic%20Timer&issue=March2002http://efymagonline.com/showme.asp?id=398&title=Remote%20Control%20Using%20AC%20Mains&issue=March2002http://efymagonline.com/showme.asp?id=397&title=IR%20Remote%20Switch&issue=March2002http://efymagonline.com/showme.asp?id=396&title=High-Power%20Telephone%20Extra%20Ringer&issue=March2002http://efymagonline.com/showme.asp?id=394&title=Doctorhttp://efymagonline.com/showme.asp?id=393&title=Ding-Dong%20Bell&issue=March2002http://efymagonline.com/showme.asp?id=392&title=5.5MHz/10.7MHz%20IF-FM%20Signal%20Generator&issue=March2002http://efymagonline.com/showme.asp?id=421&title=Two-Wire%20Remote%20Control&issue=February2002http://efymagonline.com/showme.asp?id=417&title=Make%20Your%20Own%20Automobile%20Stereo&issue=February2002http://efymagonline.com/showme.asp?id=420&title=Three%20Phase%20Star-Delta%20Motor%20Starter&issue=February2002http://efymagonline.com/showme.asp?id=419&title=Shortwave%20Transmitter&issue=February2002


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J U N E 2 0 0 2

Circuit Ideas:Contactless Ringer For Telephones

Exclusive-Or Gate Applications

Measuring Rigs And Add-Ons For Radio Amateurs

Temperature-Controlled Ni-Cd Battery ChargerWireless Stepper Motor Control

Constructions:

PC-Based Dial Clock With Timer

Voice Recording and Playback

J U L Y 2 0 0 2

Circuit Ideas:

Electronic Guard For Blind

Infra-re Toy Car Motor ControllerLED-Cum-Diode Tester

Low-Cost Battery Charger With High-/Low-Voltge Cut-OffMains Manager

Measurement Of Tranistor h(FE)

Constructions:Electronic Century Calendar

Electronic Roulette wheel

A U G U S T 2 0 0 2

Circuit Ideas:

CD-ROM Drive As Digital Audio CD Player

Guard For refrigerators And Air-ConditionersLuggage Security System

Phone Broadcaster

Power-Supply Failure AlarmPrecision 1Hz clock Generator using Chip-On-Board

Constructions:Number Guessing Game

S E P T E M B E R 2 0 0 2

Circuit Ideas:

20M, 4W QRP Transmitter

AC Line Detector

Infrared Remote Control tester

Low-Cost FM MicrophoneMulti-Pattern Running Light

priority Indicator For quiz Contents
http://efymagonline.com/showme.asp?id=737&title=priority%20Indicator%20For%20quiz%20Contents&issue=September2002http://efymagonline.com/showme.asp?id=727&title=Multi-Pattern%20Running%20Light&issue=September2002http://efymagonline.com/showme.asp?id=731&title=Low-Cost%20FM%20Microphone&issue=September2002http://efymagonline.com/showme.asp?id=725&title=Infrared%20Remote%20Control%20tester&issue=September2002http://efymagonline.com/showme.asp?id=726&title=AC%20Line%20Detector&issue=September2002http://efymagonline.com/showme.asp?id=722&title=20M,%204W%20QRP%20Transmitter&issue=September2002http://efymagonline.com/showme.asp?id=711&title=Number%20Guessing%20Game&issue=August2002http://efymagonline.com/showme.asp?id=717&title=Precision%201Hz%20clock%20Generator%20using%20Chip-On-Board&issue=August2002http://efymagonline.com/showme.asp?id=718&title=Power-Supply%20Failure%20Alarm&issue=August2002http://efymagonline.com/showme.asp?id=721&title=Phone%20Broadcaster&issue=August2002http://efymagonline.com/showme.asp?id=716&title=Luggage%20Security%20System&issue=August2002http://efymagonline.com/showme.asp?id=719&title=Guard%20For%20refrigerators%20And%20Air-Conditioners&issue=August2002http://efymagonline.com/showme.asp?id=720&title=CD-ROM%20Drive%20As%20Digital%20Audio%20CD%20Player&issue=August2002http://efymagonline.com/showme.asp?id=693&title=Electronic%20Roulette%20wheel&issue=July2002http://efymagonline.com/showme.asp?id=692&title=Electronic%20Century%20Calendar&issue=July2002http://efymagonline.com/showme.asp?id=688&title=Measurement%20Of%20Tranistor%20h%28FE%29&issue=July2002http://efymagonline.com/showme.asp?id=686&title=Mains%20Manager&issue=July2002http://efymagonline.com/showme.asp?id=690&title=Low-Cost%20Battery%20Charger%20With%20High-/Low-Voltge%20Cut-Off&issue=July2002http://efymagonline.com/showme.asp?id=687&title=LED-Cum-Diode%20Tester&issue=July2002http://efymagonline.com/showme.asp?id=689&title=Infra-re%20Toy%20Car%20Motor%20Controller&issue=July2002http://efymagonline.com/showme.asp?id=691&title=Electronic%20Guard%20For%20Blind&issue=July2002http://efymagonline.com/showme.asp?id=318&title=Voice%20Recording%20and%20Playback&issue=June2002http://efymagonline.com/showme.asp?id=319&title=PC-Based%20Dial%20Clock%20With%20Timer&issue=June2002http://efymagonline.com/showme.asp?id=340&title=Wireless%20Stepper%20Motor%20Control&issue=June2002http://efymagonline.com/showme.asp?id=334&title=Temperature-Controlled%20Ni-Cd%20Battery%20Charger&issue=June2002http://efymagonline.com/showme.asp?id=333&title=Measuring%20Rigs%20And%20Add-Ons%20For%20Radio%20Amateurs&issue=June2002http://efymagonline.com/showme.asp?id=336&title=Exclusive-Or%20Gate%20Applications&issue=June2002http://efymagonline.com/showme.asp?id=338&title=Contactless%20Ringer%20For%20Telephones&issue=June2002


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Constructions:Interactive Gal Programmer For Beginners

PICburner: The Programmer For PIC16X8X Microcontrollers

O C T O B E R 2 0 0 2Circuit Ideas:

Cell Phone Call Indicator

Home Appliance ProtectorKeyhole Finder

Remote-Controlled Fan Regulater

RMS-To-DC ConverterUsing Single Telephone on Two Telephone Lines

Constructions:

#95 Debarring Facility For Your Telephone

Microcontroller Based Access Control System

N O V E M B E R 2 0 0 2

Circuit Ideas:

Automated Traffic Signal Controller

Crystal-Controlled VFO for 40M Amateur Radio

Digital Clock with Hour AlarmFlashing Beacon

Knock Alarm

Constructions:

Multichannel Access Control System

Versatile Programmable Star Display

D E C E M B E R 2 0 0 2

Circuit Ideas:

Automatic Porch Light with MelodyIntruder Radio Alert System

Melody Generator

PC-based Oscilloscope

Constructions:

Intelligent Emergency Light

Microcontroller-Based Annunciator SystemTruth Table Evaluator And Karnaugh Map Plotter

J A N U A R Y 2 0 0 3

Circuit Ideas:Blue LED Night Lamp with Back-up

Computerised Universal Timer
http://efymagonline.com/showme.asp?id=823&title=Computerised%20Universal%20Timer&issue=January2003http://efymagonline.com/showme.asp?id=821&title=Blue%20LED%20Night%20Lamp%20with%20Back-up&issue=January2003http://efymagonline.com/showme.asp?id=801&title=Truth%20Table%20Evaluator%20And%20Karnaugh%20Map%20Plotter&issue=December2002http://efymagonline.com/showme.asp?id=799&title=Microcontroller-Based%20Annunciator%20System&issue=December2002http://efymagonline.com/showme.asp?id=800&title=Intelligent%20Emergency%20Light&issue=December2002http://efymagonline.com/showme.asp?id=795&title=PC-based%20Oscilloscope&issue=December2002http://efymagonline.com/showme.asp?id=798&title=Melody%20Generator&issue=December2002http://efymagonline.com/showme.asp?id=796&title=Intruder%20Radio%20Alert%20System&issue=December2002http://efymagonline.com/showme.asp?id=797&title=Automatic%20Porch%20Light%20with%20Melody&issue=December2002http://efymagonline.com/showme.asp?id=765&title=Versatile%20Programmable%20Star%20Display&issue=November2002http://efymagonline.com/showme.asp?id=766&title=Multichannel%20Access%20Control%20System&issue=November2002http://efymagonline.com/showme.asp?id=771&title=Knock%20Alarm&issue=November2002http://efymagonline.com/showme.asp?id=770&title=Flashing%20Beacon&issue=November2002http://efymagonline.com/showme.asp?id=767&title=Digital%20Clock%20with%20Hour%20Alarm&issue=November2002http://efymagonline.com/showme.asp?id=769&title=Crystal-Controlled%20VFO%20for%2040M%20Amateur%20Radio&issue=November2002http://efymagonline.com/showme.asp?id=768&title=Automated%20Traffic%20Signal%20Controller&issue=November2002http://efymagonline.com/showme.asp?id=760&title=Microcontroller%20Based%20Access%20Control%20System&issue=October2002http://efymagonline.com/showme.asp?id=759&title=#95%20Debarring%20Facility%20For%20Your%20Telephone&issue=October2002http://efymagonline.com/showme.asp?id=758&title=Using%20Single%20Telephone%20on%20Two%20Telephone%20Lines&issue=October2002http://efymagonline.com/showme.asp?id=744&title=RMS-To-DC%20Converter&issue=October2002http://efymagonline.com/showme.asp?id=757&title=Remote-Controlled%20Fan%20Regulater&issue=October2002http://efymagonline.com/showme.asp?id=752&title=Keyhole%20Finder&issue=October2002http://efymagonline.com/showme.asp?id=743&title=Home%20Appliance%20Protector&issue=October2002http://efymagonline.com/showme.asp?id=756&title=Cell%20Phone%20Call%20Indicator&issue=October2002http://efymagonline.com/showme.asp?id=723&title=PICburner:%20The%20Programmer%20For%20PIC16X8X%20Microcontrollers&issue=September2002http://efymagonline.com/showme.asp?id=724&title=Interactive%20Gal%20Programmer%20For%20Beginners&issue=September2002


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Infrared Proximity Detector

Intelligent Water Pump Controller with Water-Level DisplayNumber Guessing Game

Precision 1Hz Clock

Constructions:Car Security System With Remote Control

F E B R U A R Y 2 0 0 3

Circuit Ideas:

Garage Light and Security Control

LED Sand-Glass TimerPWM-Based Speed Control for DC Motors

Three-Colour Display Using Bicolour LEDs

Ultra-Bright LED Lamp

Water-Level Indicator

Constructions:

DTMF Remote Control SystemPC-Based Programmer for AT89C51 Microcontroller

M A R C H 2 0 0 3

Circuit Ideas:Clap-Based Switching For Devices

Electronic Security System

Keypad Control For Multiple AppliancesLead-Acid Battery Charger With Voltage Analyser

Versatile Emergency Light Using Fluorescent Tubes

Wireless TV Headphone Circuit

Constructions:

A Tutorial on 89C51 Development KitPart II

Programmable Logic Controller

A P R I L 2 0 0 3

Circuit Ideas:Anti-Theft Alarm For Vehicles

Automatic Water Pump Motor Controller

Electric Shock Gun

Multi-Switch Doorbell With IndicatorsSong Number Display

Constructions:

A Tutorial On 89C51 Development KitPart IIIAutomated Car Parking System
http://efymagonline.com/showme.asp?id=877&title=Automated%20Car%20Parking%20System&issue=April2003http://efymagonline.com/showme.asp?id=876&title=A%20Tutorial%20On%2089C51%20Development%20Kit%E2%80%94Part%20III&issue=April2003http://efymagonline.com/showme.asp?id=868&title=Song%20Number%20Display&issue=April2003http://efymagonline.com/showme.asp?id=867&title=Multi-Switch%20Doorbell%20With%20Indicators&issue=April2003http://efymagonline.com/showme.asp?id=865&title=Electric%20Shock%20Gun&issue=April2003http://efymagonline.com/showme.asp?id=864&title=Automatic%20Water%20Pump%20Motor%20Controller&issue=April2003http://efymagonline.com/showme.asp?id=866&title=Anti-Theft%20Alarm%20For%20Vehicles&issue=April2003http://efymagonline.com/showme.asp?id=855&title=Programmable%20Logic%20Controller&issue=March2003http://efymagonline.com/showme.asp?id=856&title=A%20Tutorial%20on%2089C51%20Development%20Kit%E2%80%94Part%20II&issue=March2003http://efymagonline.com/showme.asp?id=861&title=Wireless%20TV%20Headphone%20Circuit&issue=March2003http://efymagonline.com/showme.asp?id=857&title=Versatile%20Emergency%20Light%20Using%20Fluorescent%20Tubes&issue=March2003http://efymagonline.com/showme.asp?id=860&title=Lead-Acid%20Battery%20Charger%20With%20Voltage%20Analyser&issue=March2003http://efymagonline.com/showme.asp?id=862&title=Keypad%20Control%20For%20Multiple%20Appliances&issue=March2003http://efymagonline.com/showme.asp?id=858&title=Electronic%20Security%20System&issue=March2003http://efymagonline.com/showme.asp?id=859&title=Clap-Based%20Switching%20For%20Devices&issue=March2003http://efymagonline.com/showme.asp?id=1099&title=PC-Based%20Programmer%20for%20AT89C51%20Microcontroller&issue=February2003http://efymagonline.com/showme.asp?id=1100&title=DTMF%20Remote%20Control%20System&issue=February2003http://efymagonline.com/showme.asp?id=1093&title=Water-Level%20Indicator&issue=February2003http://efymagonline.com/showme.asp?id=1094&title=Ultra-Bright%20LED%20Lamp&issue=February2003http://efymagonline.com/showme.asp?id=1097&title=Three-Colour%20Display%20Using%20Bicolour%20LEDs&issue=February2003http://efymagonline.com/showme.asp?id=1096&title=PWM-Based%20Speed%20Control%20for%20DC%20Motors&issue=February2003http://efymagonline.com/showme.asp?id=1098&title=LED%20Sand-Glass%20Timer&issue=February2003http://efymagonline.com/showme.asp?id=1095&title=Garage%20Light%20and%20Security%20Control&issue=February2003http://efymagonline.com/showme.asp?id=815&title=Car%20Security%20System%20With%20Remote%20Control&issue=January2003http://efymagonline.com/showme.asp?id=820&title=Precision%201Hz%20Clock&issue=January2003http://efymagonline.com/showme.asp?id=824&title=Number%20Guessing%20Game&issue=January2003http://efymagonline.com/showme.asp?id=819&title=Intelligent%20Water%20Pump%20Controller%20with%20Water-Level%20Display&issue=January2003http://efymagonline.com/showme.asp?id=822&title=Infrared%20Proximity%20Detector&issue=January2003


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M A Y 2 0 0 3

Circuit Ideas:

0-100C Temperature Detector

Clap Switch

Infrared Remote Control TimerLow-Range AM Radio Transmitter

Precision Null Detector

Sound Scanner

Constructions:

Simple 32-Bit Relay Card For PCs Parallel PortTemperature Measurement Using Transistor As Sensor

J U N E 2 0 0 3

Circuit Ideas:

DTMF Receiver IC MT8870 TesterEarth Fault Protector

Intruder Detector Using Laser TorchPulse Generator

Simple FM Receiver

Constructions:

Digital Clock With Seconds And Alarm Time Display

Programmable Light Effects Generator

J U L Y 2 0 0 3

Circuit Ideas:

Burglar Alarm SystemFalse Triggering Eliminator For Timer 555

Parallel Telephone With Secrecy And Call Prevention

PC-Driven LED DisplaySolidstate Signal Lamp

Voltage-Based Controller For Switches

Constructions:

Door-Opening Alarm With Remote Control

Microcontroller-Driven Data Display

A U G U S T 2 0 0 3

Circuit Ideas:

Doorbell with Security Feature

Low-Cost Hearing AidOver-/Under-Voltage Protection of Electrical Appliances

Resistance Measurement Using Sample and Hold Method
http://efymagonline.com/showme.asp?id=943&title=Resistance%20Measurement%20Using%20Sample%20and%20Hold%20Method&issue=August2003http://efymagonline.com/showme.asp?id=941&title=Over-/Under-Voltage%20Protection%20of%20Electrical%20Appliances&issue=August2003http://efymagonline.com/showme.asp?id=939&title=Low-Cost%20Hearing%20Aid&issue=August2003http://efymagonline.com/showme.asp?id=942&title=Doorbell%20with%20Security%20Feature&issue=August2003http://efymagonline.com/showme.asp?id=928&title=Microcontroller-Driven%20Data%20Display&issue=July2003http://efymagonline.com/showme.asp?id=927&title=Door-Opening%20Alarm%20With%20Remote%20Control&issue=July2003http://efymagonline.com/showme.asp?id=925&title=Voltage-Based%20Controller%20For%20Switches&issue=July2003http://efymagonline.com/showme.asp?id=922&title=Solidstate%20Signal%20Lamp&issue=July2003http://efymagonline.com/showme.asp?id=921&title=PC-Driven%20LED%20Display&issue=July2003http://efymagonline.com/showme.asp?id=923&title=Parallel%20Telephone%20With%20Secrecy%20And%20Call%20Prevention&issue=July2003http://efymagonline.com/showme.asp?id=924&title=False%20Triggering%20Eliminator%20For%20Timer%20555&issue=July2003http://efymagonline.com/showme.asp?id=926&title=Burglar%20Alarm%20System&issue=July2003http://efymagonline.com/showme.asp?id=907&title=Programmable%20Light%20Effects%20Generator&issue=June2003http://efymagonline.com/showme.asp?id=906&title=Digital%20Clock%20With%20Seconds%20And%20Alarm%20Time%20Display&issue=June2003http://efymagonline.com/showme.asp?id=904&title=Simple%20FM%20Receiver&issue=June2003http://efymagonline.com/showme.asp?id=901&title=Pulse%20Generator&issue=June2003http://efymagonline.com/showme.asp?id=903&title=Intruder%20Detector%20Using%20Laser%20Torch&issue=June2003http://efymagonline.com/showme.asp?id=899&title=Earth%20Fault%20Protector&issue=June2003http://efymagonline.com/showme.asp?id=900&title=DTMF%20Receiver%20IC%20MT8870%20Tester&issue=June2003http://efymagonline.com/showme.asp?id=895&title=Temperature%20Measurement%20Using%20Transistor%20As%20Sensor&issue=May2003http://efymagonline.com/showme.asp?id=894&title=Simple%2032-Bit%20Relay%20Card%20For%20PC%E2%80%99s%20Parallel%20Port&issue=May2003http://efymagonline.com/showme.asp?id=892&title=Sound%20Scanner&issue=May2003http://efymagonline.com/showme.asp?id=889&title=Precision%20Null%20Detector&issue=May2003http://efymagonline.com/showme.asp?id=893&title=Low-Range%20AM%20Radio%20Transmitter&issue=May2003http://efymagonline.com/showme.asp?id=890&title=Infrared%20Remote%20Control%20Timer&issue=May2003http://efymagonline.com/showme.asp?id=891&title=Clap%20Switch&issue=May2003http://efymagonline.com/showme.asp?id=888&title=0-100%C2%B0C%20Temperature%20Detector&issue=May2003


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Touch Bell

Transistor Teste

Constructions:

Microprocessor-Controlled Thermometer

Simple Multichannel Remote Control System

S E P T E M B E R 2 0 0 3

Circuit Ideas:

Alarm Using Your Own Voice

Mobile Phone Multipower Unit

Sensitive FM TransmitterTelephone Receiver

Vehicle Security System

Washing Machine Motor Controller

Constructions:

DTMF 8-Channel Switching Via Powerline

Two-in-One Stereo Amplifier

O C T O B E R 2 0 0 3

Circuit Ideas:

Auto Snooze for Digital Alarm ClocksElectronic Motor Starter

Remote-Operated Musical Bell

Simple Touch-Sensitive SwitchSmoke Extractor

Constructions:

Multifeature Emergency LightMultiple Device Switching Using PC's Parallel Port

N O V E M B E R 2 0 0 3

Circuit Ideas:

Electrolytic Capacitor Tester

Flashing Headlight For MobikesKey Chain Light

Mosfet-Based Preamplifier for FM Radio DXing

Non-Contact Power MonitorWireless Door Opening Alarm

Constructions:

Binary-To-Hexadecimal DecoderProportional Load Control Using PC
http://efymagonline.com/showme.asp?id=1004&title=Proportional%20Load%20Control%20Using%20PC&issue=November2003http://efymagonline.com/showme.asp?id=1005&title=Binary-To-Hexadecimal%20Decoder&issue=November2003http://efymagonline.com/showme.asp?id=999&title=Wireless%20Door%20Opening%20Alarm&issue=November2003http://efymagonline.com/showme.asp?id=1000&title=Non-Contact%20Power%20Monitor&issue=November2003http://efymagonline.com/showme.asp?id=1001&title=Mosfet-Based%20Preamplifier%20for%20FM%20Radio%20DXing&issue=November2003http://efymagonline.com/showme.asp?id=1003&title=Key%20Chain%20Light&issue=November2003http://efymagonline.com/showme.asp?id=998&title=Flashing%20Headlight%20For%20Mobikes&issue=November2003http://efymagonline.com/showme.asp?id=1002&title=Electrolytic%20Capacitor%20Tester&issue=November2003http://efymagonline.com/showme.asp?id=983&title=Multiple%20Device%20Switching%20Using%20PChttp://efymagonline.com/showme.asp?id=982&title=Multifeature%20Emergency%20Light&issue=October2003http://efymagonline.com/showme.asp?id=979&title=Smoke%20Extractor&issue=October2003http://efymagonline.com/showme.asp?id=977&title=Simple%20Touch-Sensitive%20Switch&issue=October2003http://efymagonline.com/showme.asp?id=978&title=Remote-Operated%20Musical%20Bell&issue=October2003http://efymagonline.com/showme.asp?id=981&title=Electronic%20Motor%20Starter&issue=October2003http://efymagonline.com/showme.asp?id=980&title=Auto%20Snooze%20for%20Digital%20Alarm%20Clocks&issue=October2003http://efymagonline.com/showme.asp?id=966&title=Two-in-One%20Stereo%20Amplifier&issue=September2003http://efymagonline.com/showme.asp?id=965&title=DTMF%208-Channel%20Switching%20Via%20Powerline&issue=September2003http://efymagonline.com/showme.asp?id=963&title=Washing%20Machine%20Motor%20Controller&issue=September2003http://efymagonline.com/showme.asp?id=960&title=Vehicle%20Security%20System&issue=September2003http://efymagonline.com/showme.asp?id=962&title=Telephone%20Receiver&issue=September2003http://efymagonline.com/showme.asp?id=959&title=Sensitive%20FM%20Transmitter&issue=September2003http://efymagonline.com/showme.asp?id=961&title=Mobile%20Phone%20Multipower%20Unit&issue=September2003http://efymagonline.com/showme.asp?id=964&title=Alarm%20Using%20Your%20Own%20Voice&issue=September2003http://efymagonline.com/showme.asp?id=946&title=Simple%20Multichannel%20Remote%20Control%20System&issue=August2003http://efymagonline.com/showme.asp?id=945&title=Microprocessor-Controlled%20Thermometer&issue=August2003http://efymagonline.com/showme.asp?id=938&title=Transistor%20Tester&issue=August2003http://efymagonline.com/showme.asp?id=940&title=Touch%20Bell&issue=August2003


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D E C E M B E R 2 0 0 3

Circuit Ideas:Automatic Night Lamp with Morning Alarm

Experimental Study of Switched-Capacitor Circuit

Fan On/Off Control by Light

Intercom with Musical RingtoneLED Torch

Touch Dimmer

Constructions:

Controlling a 7-Segment Display Using PCs Parallel Port

Economical UPS for Cordless Phones

J A N U A R Y 2 0 0 4

Circuit Ideas:

DC-To-DC Converter

Intruder AlarmLED-Based Message Display

Multiband CW TransmitterVersatile Proximity Detector with Auto Reset

Window Charger

Constructions:

Automatic Water-Level Controller

Microcontroller-Based Call Indicator

F E B R U A R Y 2 0 0 4

Circuit Ideas:

Anti-Bag-Snatching Alarm

LED-Based Reading LampOff Timer with Alarm

Over-Voltage Protector

Programmable Timer for Appliances

Constructions:

Digital Water-Level Indicator Cum Pump ControllerPC-Based Data Logger

M A R C H 2 0 0 4

Circuit Ideas:

AC Mains Voltage Indicator

Doorbell-Controlled Porchlight

Fuse-Cum-Power Failure Indicator

Mobile Cellphone ChargerSmart Foot Switch

Sound-Operated Light
http://efymagonline.com/showme.asp?id=1079&title=Sound-Operated%20Light&issue=March2004http://efymagonline.com/showme.asp?id=1077&title=Smart%20Foot%20Switch&issue=March2004http://efymagonline.com/showme.asp?id=1075&title=Mobile%20Cellphone%20Charger&issue=March2004http://efymagonline.com/showme.asp?id=1076&title=Fuse-Cum-Power%20Failure%20Indicator&issue=March2004http://efymagonline.com/showme.asp?id=1080&title=Doorbell-Controlled%20Porchlight&issue=March2004http://efymagonline.com/showme.asp?id=1078&title=AC%20Mains%20Voltage%20Indicator&issue=March2004http://efymagonline.com/showme.asp?id=1067&title=PC-Based%20Data%20Logger&issue=February2004http://efymagonline.com/showme.asp?id=1059&title=Digital%20Water-Level%20Indicator%20Cum%20Pump%20Controller&issue=February2004http://efymagonline.com/showme.asp?id=1061&title=Programmable%20Timer%20for%20Appliances&issue=February2004http://efymagonline.com/showme.asp?id=1064&title=Over-Voltage%20Protector&issue=February2004http://efymagonline.com/showme.asp?id=1063&title=Off%20Timer%20with%20Alarm&issue=February2004http://efymagonline.com/showme.asp?id=1065&title=LED-Based%20Reading%20Lamp&issue=February2004http://efymagonline.com/showme.asp?id=1062&title=Anti-Bag-Snatching%20Alarm&issue=February2004http://efymagonline.com/showme.asp?id=1037&title=Microcontroller-Based%20Call%20Indicator&issue=January2004http://efymagonline.com/showme.asp?id=1046&title=Automatic%20Water-Level%20Controller&issue=January2004http://efymagonline.com/showme.asp?id=1044&title=Window%20Charger&issue=January2004http://efymagonline.com/showme.asp?id=1043&title=Versatile%20Proximity%20Detector%20with%20Auto%20Reset&issue=January2004http://efymagonline.com/showme.asp?id=1045&title=Multiband%20CW%20Transmitter&issue=January2004http://efymagonline.com/showme.asp?id=1041&title=LED-Based%20Message%20Display&issue=January2004http://efymagonline.com/showme.asp?id=1040&title=Intruder%20Alarm&issue=January2004http://efymagonline.com/showme.asp?id=1042&title=DC-To-DC%20Converter&issue=January2004http://efymagonline.com/showme.asp?id=1022&title=Economical%20UPS%20for%20Cordless%20Phones&issue=December2003http://efymagonline.com/showme.asp?id=1021&title=Controlling%20a%207-Segment%20Display%20Using%20PC%E2%80%99s%20Parallel%20Port&issue=December2003http://efymagonline.com/showme.asp?id=1020&title=Touch%20Dimmer&issue=December2003http://efymagonline.com/showme.asp?id=1017&title=LED%20Torch&issue=December2003http://efymagonline.com/showme.asp?id=1018&title=Intercom%20with%20Musical%20Ringtone&issue=December2003http://efymagonline.com/showme.asp?id=1016&title=Fan%20On/Off%20Control%20by%20Light&issue=December2003http://efymagonline.com/showme.asp?id=1019&title=Experimental%20Study%20of%20Switched-Capacitor%20Circuit&issue=December2003http://efymagonline.com/showme.asp?id=1015&title=Automatic%20Night%20Lamp%20with%20Morning%20Alarm&issue=December2003


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Constructions:

Lift Overload PreventerSound-Operated On/Off Switch

A P R I L 2 0 0 4Circuit Ideas:

Highway Alert Signal Lamp

Low-Cost Electronic Quiz TableLow-Resistance Continuity Tester

Simple Security System

Variable Power Supply With Digital ControlZener Diode Tester

Constructions:

A Bidirectional Visitors Counter

Digital Clock Using Discrete ICs

M A Y 2 0 0 4

Circuit Ideas:

Child's Lamp

Clap-Operated Electronic Switch

Emergency-Cum-Ultraviolet LightLight-Controlled Digital Fan Regulator

Sensitive Optical Burglar Alarm

Watchman Watcher

Constructions:

Programmer For 89C51/89C52/89C2051 Microcontrollers

J U N E 2 0 0 4

Circuit Ideas:

Cell-Phone-Controlled Audio/Video Mute SwitchDome Lamp Dimmer

Frequency Divider Using 7490 Decade Counter

Panel Frequency MeterPC-Based DC Motor Speed Controller

Random Flashing X-Mas Stars

Constructions:

Device Switching Using Password

Laser-Based Communication Link
http://efymagonline.com/showme.asp?id=1150&title=Laser-Based%20Communication%20Link&issue=June2004http://efymagonline.com/showme.asp?id=1148&title=Device%20Switching%20Using%20Password&issue=June2004http://efymagonline.com/showme.asp?id=1160&title=Random%20Flashing%20X-Mas%20Stars&issue=June2004http://efymagonline.com/showme.asp?id=1161&title=PC-Based%20DC%20Motor%20Speed%20Controller&issue=June2004http://efymagonline.com/showme.asp?id=1158&title=Panel%20Frequency%20Meter&issue=June2004http://efymagonline.com/showme.asp?id=1162&title=Frequency%20Divider%20Using%207490%20Decade%20Counter&issue=June2004http://efymagonline.com/showme.asp?id=1159&title=Dome%20Lamp%20Dimmer&issue=June2004http://efymagonline.com/showme.asp?id=1157&title=Cell-Phone-Controlled%20Audio/Video%20Mute%20Switch&issue=June2004http://efymagonline.com/showme.asp?id=1135&title=Programmer%20For%2089C51/89C52/89C2051%20Microcontrollers&issue=May2004http://efymagonline.com/showme.asp?id=1133&title=Watchman%20Watcher&issue=May2004http://efymagonline.com/showme.asp?id=1130&title=Sensitive%20Optical%20Burglar%20Alarm&issue=May2004http://efymagonline.com/showme.asp?id=1132&title=Light-Controlled%20Digital%20Fan%20Regulator&issue=May2004http://efymagonline.com/showme.asp?id=1134&title=Emergency-Cum-Ultraviolet%20Light&issue=May2004http://efymagonline.com/showme.asp?id=1131&title=Clap-Operated%20Electronic%20Switch&issue=May2004http://efymagonline.com/showme.asp?id=1129&title=Childhttp://efymagonline.com/showme.asp?id=1115&title=Digital%20Clock%20Using%20Discrete%20ICs&issue=April2004http://efymagonline.com/showme.asp?id=1116&title=A%20Bidirectional%20Visitors%20Counter&issue=April2004http://efymagonline.com/showme.asp?id=1110&title=Zener%20Diode%20Tester&issue=April2004http://efymagonline.com/showme.asp?id=1113&title=Variable%20Power%20Supply%20With%20Digital%20Control&issue=April2004http://efymagonline.com/showme.asp?id=1114&title=Simple%20Security%20System&issue=April2004http://efymagonline.com/showme.asp?id=1112&title=Low-Resistance%20Continuity%20Tester&issue=April2004http://efymagonline.com/showme.asp?id=1109&title=Low-Cost%20Electronic%20Quiz%20Table&issue=April2004http://efymagonline.com/showme.asp?id=1111&title=Highway%20Alert%20Signal%20Lamp&issue=April2004http://efymagonline.com/showme.asp?id=1081&title=Sound-Operated%20On/Off%20Switch&issue=March2004http://efymagonline.com/showme.asp?id=1082&title=Lift%20Overload%20Preventer&issue=March2004


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J U L Y 2 0 0 4

Circuit Ideas:

8-Digit Code Lock for Appliance Switching

Digital Stop Watch

Light-Operated Internal Door Latch

Offset Tuning Indicator for CWStabilised Power Supply with Short-Circuit Indication

Constructions:

Remote-Controlled Sophisticated Electronic Code Lock

Temperature Indicator Using AT89C52

A U G U S T 2 0 0 4

Circuit Ideas:

Faulty Car Indicator Alarm

Flashing-Cum-Running Light

Mains Box Heat MonitorQuality FM Transmitter

Simple Key-Operated Gate Locking System

Constructions:

Load Protector With Remote Switching Facility

PIC16F84-Based Coded Device Switching System

S E P T E M B E R 2 0 0 4

Circuit Ideas:

DC Motor Control Using A Single Switch

Handy Tester

PC-Based Candle Ignitor

Programmable Electronic DiceSolidstate Remote Control Switch

Constructions:

Dynamic Temperature Indicator and Controller

Voice Recording and Playback Using APR9600 Chip

O C T O B E R 2 0 0 4

Circuit Ideas:

Anti-Theft Alarm For Bikes

Automatic School BellAutomatic Water Pump Controller

Microcontroller-Based Monitoring System

Noise Meter

Timer With Musical Alarm
http://efymagonline.com/showme.asp?id=1237&title=Timer%20With%20Musical%20Alarm&issue=October2004http://efymagonline.com/showme.asp?id=1236&title=Noise%20Meter&issue=October2004http://efymagonline.com/showme.asp?id=1232&title=Microcontroller-Based%20Monitoring%20System&issue=October2004http://efymagonline.com/showme.asp?id=1234&title=Automatic%20Water%20Pump%20Controller&issue=October2004http://efymagonline.com/showme.asp?id=1233&title=Automatic%20School%20Bell&issue=October2004http://efymagonline.com/showme.asp?id=1235&title=Anti-Theft%20Alarm%20For%20Bikes&issue=October2004http://efymagonline.com/showme.asp?id=1206&title=Voice%20Recording%20and%20Playback%20Using%20APR9600%20Chip&issue=September2004http://efymagonline.com/showme.asp?id=1207&title=Dynamic%20Temperature%20Indicator%20and%20Controller&issue=September2004http://efymagonline.com/showme.asp?id=1205&title=Solidstate%20Remote%20Control%20Switch&issue=September2004http://efymagonline.com/showme.asp?id=1203&title=Programmable%20Electronic%20Dice&issue=September2004http://efymagonline.com/showme.asp?id=1204&title=PC-Based%20Candle%20Ignitor&issue=September2004http://efymagonline.com/showme.asp?id=1201&title=Handy%20Tester&issue=September2004http://efymagonline.com/showme.asp?id=1202&title=DC%20Motor%20Control%20Using%20A%20Single%20Switch&issue=September2004http://efymagonline.com/showme.asp?id=1188&title=PIC16F84-Based%20Coded%20Device%20Switching%20System&issue=August2004http://efymagonline.com/showme.asp?id=1189&title=Load%20Protector%20With%20Remote%20Switching%20Facility&issue=August2004http://efymagonline.com/showme.asp?id=1185&title=Simple%20Key-Operated%20Gate%20Locking%20System&issue=August2004http://efymagonline.com/showme.asp?id=1187&title=Quality%20FM%20Transmitter&issue=August2004http://efymagonline.com/showme.asp?id=1186&title=Mains%20Box%20Heat%20Monitor&issue=August2004http://efymagonline.com/showme.asp?id=1184&title=Flashing-Cum-Running%20Light&issue=August2004http://efymagonline.com/showme.asp?id=1183&title=Faulty%20Car%20Indicator%20Alarm&issue=August2004http://efymagonline.com/showme.asp?id=1171&title=Temperature%20Indicator%20Using%20AT89C52&issue=July2004http://efymagonline.com/showme.asp?id=1170&title=Remote-Controlled%20Sophisticated%20Electronic%20Code%20Lock&issue=July2004http://efymagonline.com/showme.asp?id=1167&title=Stabilised%20Power%20Supply%20with%20Short-Circuit%20Indication&issue=July2004http://efymagonline.com/showme.asp?id=1166&title=Offset%20Tuning%20Indicator%20for%20CW&issue=July2004http://efymagonline.com/showme.asp?id=1168&title=Light-Operated%20Internal%20Door%20Latch&issue=July2004http://efymagonline.com/showme.asp?id=1169&title=Digital%20Stop%20Watch&issue=July2004http://efymagonline.com/showme.asp?id=1165&title=8-Digit%20Code%20Lock%20for%20Appliance%20Switching&issue=July2004


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Constructions:

Microprocessor-Based Home Security SystemStepper Motor Control Using 89C51 Microcontroller

N O V E M B E R 2 0 0 4

Circuit Ideas:Electronic Watchdog

Fire Alarm Using Thermistor

Mains Failure/Resumption AlarmMultipurpose White-LED Light

Soldering Iron Temperature Controller

Constructions:

Digital Combination Lock

Safety Guard for the Blind

D E C E M B E R 2 0 0 4

Circuit Ideas:

Chanting PlayerElectronic Street Light Switch

Hit Switch

Sound-Operated Intruder Alarm

Twilight Lamp BlinkerWater-Level Controller

Constructions:

Moving Message Over Dot-Matrix Display

Ultrasonic Lamp-Brightness Controller

J A N U A R Y 2 0 0 5

Circuit Ideas:

Audio Amplifier for Personal Stereo

Automatic Soldering Iron SwitchInfrared Object Counter

Long-Range Burglar Alarm Using Laser Torch

Musical Light ChaserVersatile LED Display

Constructions:

Microcontroller-based Real-time ClockStandalone Scrolling Display Using AT90S8515 AVR

F E B R U A R Y 2 0 0 5

Circuit Ideas:

Atmel AVR ISP Dongle

Auto Turn-Off Battery Charger
http://efymagonline.com/showme.asp?id=1296&title=Auto%20Turn-Off%20Battery%20Charger&issue=February2005http://efymagonline.com/showme.asp?id=1300&title=Atmel%20AVR%20ISP%20Dongle&issue=February2005http://efymagonline.com/showme.asp?id=1282&title=Standalone%20Scrolling%20Display%20Using%20AT90S8515%20AVR&issue=January2005http://efymagonline.com/showme.asp?id=1281&title=Microcontroller-based%20Real-time%20Clock&issue=January2005http://efymagonline.com/showme.asp?id=1293&title=Versatile%20LED%20Display&issue=January2005http://efymagonline.com/showme.asp?id=1291&title=Musical%20Light%20Chaser&issue=January2005http://efymagonline.com/showme.asp?id=1290&title=Long-Range%20Burglar%20Alarm%20Using%20Laser%20Torch&issue=January2005http://efymagonline.com/showme.asp?id=1289&title=Infrared%20Object%20Counter&issue=January2005http://efymagonline.com/showme.asp?id=1292&title=Automatic%20Soldering%20Iron%20Switch&issue=January2005http://efymagonline.com/showme.asp?id=1288&title=Audio%20Amplifier%20for%20Personal%20Stereo&issue=January2005http://efymagonline.com/showme.asp?id=1263&title=Ultrasonic%20Lamp-Brightness%20Controller&issue=December2004http://efymagonline.com/showme.asp?id=1264&title=Moving%20Message%20Over%20Dot-Matrix%20Display&issue=December2004http://efymagonline.com/showme.asp?id=1259&title=Water-Level%20Controller&issue=December2004http://efymagonline.com/showme.asp?id=1257&title=Twilight%20Lamp%20Blinker&issue=December2004http://efymagonline.com/showme.asp?id=1260&title=Sound-Operated%20Intruder%20Alarm&issue=December2004http://efymagonline.com/showme.asp?id=1261&title=Hit%20Switch&issue=December2004http://efymagonline.com/showme.asp?id=1258&title=Electronic%20Street%20Light%20Switch&issue=December2004http://efymagonline.com/showme.asp?id=1262&title=Chanting%20Player&issue=December2004http://efymagonline.com/showme.asp?id=1245&title=Safety%20Guard%20for%20the%20Blind&issue=November2004http://efymagonline.com/showme.asp?id=1244&title=Digital%20Combination%20Lock&issue=November2004http://efymagonline.com/showme.asp?id=1239&title=Soldering%20Iron%20Temperature%20Controller&issue=November2004http://efymagonline.com/showme.asp?id=1241&title=Multipurpose%20White-LED%20Light&issue=November2004http://efymagonline.com/showme.asp?id=1240&title=Mains%20Failure/Resumption%20Alarm&issue=November2004http://efymagonline.com/showme.asp?id=1242&title=Fire%20Alarm%20Using%20Thermistor&issue=November2004http://efymagonline.com/showme.asp?id=1243&title=Electronic%20Watchdog&issue=November2004http://efymagonline.com/showme.asp?id=1222&title=Stepper%20Motor%20Control%20Using%2089C51%20Microcontroller&issue=October2004http://efymagonline.com/showme.asp?id=1223&title=Microprocessor-Based%20Home%20Security%20System&issue=October2004


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Digital Frequency Comparator

Miser FlashPC-Based Timer

Pencell Charge Indicator

Constructions:Remote-Controlled Digital Audio Processor

M A R C H 2 0 0 5

Circuit Ideas:

Automatic Bathroom Light with Back-up Lamp

Digital Audio/Video Input SelectorManual EPROM Programmer

Multiple Applications of High-Power LEDs

Simple Digital Security System

Wireless Stepper Motor Controller

Constructions:

Auto Changeover to Generator on Mains FailurePart I

Device Control Through PCs Parallel Port Using Visual Basic

A P R I L 2005

Circuit Ideas:

Accurate Foot-Switch

Mains Interruption Counter With Indicator

Micromotor ControllerPower-On Reminder with LED Lamp

Simple Low-Power Inverter

Solar Bug

Constructions:

Auto Changeover to Generator on Mains FailurePart II

PC-based Scrolling Message Display

M A Y 2005

Circuit Ideas:

Mains Supply Failure Alarm

Mock Alarm With Call Bell

Power-Saver LED Lamp

Remote Control For Home AppliancesSound-Operated Switch For Lamps

TV Pattern Generator

Constructions:

Low-Cost Energy Meter Using ADE7757

Two-Wheeler Security System
http://efymagonline.com/showme.asp?id=1364&title=Two-Wheeler%20Security%20System&issue=May2005http://efymagonline.com/showme.asp?id=1363&title=Low-Cost%20Energy%20Meter%20Using%20ADE7757&issue=May2005http://efymagonline.com/showme.asp?id=1362&title=TV%20Pattern%20Generator&issue=May2005http://efymagonline.com/showme.asp?id=1361&title=Sound-Operated%20Switch%20For%20Lamps&issue=May2005http://efymagonline.com/showme.asp?id=1357&title=Remote%20Control%20For%20Home%20Appliances&issue=May2005http://efymagonline.com/showme.asp?id=1359&title=Power-Saver%20LED%20Lamp&issue=May2005http://efymagonline.com/showme.asp?id=1358&title=Mock%20Alarm%20With%20Call%20Bell&issue=May2005http://efymagonline.com/showme.asp?id=1360&title=Mains%20Supply%20Failure%20Alarm&issue=May2005http://efymagonline.com/showme.asp?id=1338&title=PC-based%20Scrolling%20Message%20Display&issue=April2005http://efymagonline.com/showme.asp?id=1339&title=Auto%20Changeover%20to%20Generator%20on%20Mains%20Failure%E2%80%94Part%20II&issue=April2005http://efymagonline.com/showme.asp?id=1337&title=Solar%20Bug&issue=April2005http://efymagonline.com/showme.asp?id=1336&title=Simple%20Low-Power%20Inverter&issue=April2005http://efymagonline.com/showme.asp?id=1334&title=Power-On%20Reminder%20with%20LED%20Lamp&issue=April2005http://efymagonline.com/showme.asp?id=1333&title=Micromotor%20Controller&issue=April2005http://efymagonline.com/showme.asp?id=1335&title=Mains%20Interruption%20Counter%20With%20Indicator&issue=April2005http://efymagonline.com/showme.asp?id=1332&title=Accurate%20Foot-Switch&issue=April2005http://efymagonline.com/showme.asp?id=1320&title=Device%20Control%20Through%20PC%E2%80%99s%20Parallel%20Port%20Using%20Visual%20Basic&issue=March2005http://efymagonline.com/showme.asp?id=1321&title=Auto%20Changeover%20to%20Generator%20on%20Mains%20Failure%E2%80%94Part%20I&issue=March2005http://efymagonline.com/showme.asp?id=1315&title=Wireless%20Stepper%20Motor%20Controller&issue=March2005http://efymagonline.com/showme.asp?id=1316&title=Simple%20Digital%20Security%20System&issue=March2005http://efymagonline.com/showme.asp?id=1317&title=Multiple%20Applications%20of%20High-Power%20LEDs&issue=March2005http://efymagonline.com/showme.asp?id=1314&title=Manual%20EPROM%20Programmer&issue=March2005http://efymagonline.com/showme.asp?id=1319&title=Digital%20Audio/Video%20Input%20Selector%20&issue=March2005http://efymagonline.com/showme.asp?id=1318&title=Automatic%20Bathroom%20Light%20with%20Back-up%20Lamp&issue=March2005http://efymagonline.com/showme.asp?id=1302&title=Remote-Controlled%20Digital%20Audio%20Processor&issue=February2005http://efymagonline.com/showme.asp?id=1297&title=Pencell%20Charge%20Indicator&issue=February2005http://efymagonline.com/showme.asp?id=1299&title=PC-Based%20Timer&issue=February2005http://efymagonline.com/showme.asp?id=1298&title=Miser%20Flash&issue=February2005http://efymagonline.com/showme.asp?id=1301&title=Digital%20Frequency%20Comparator&issue=February2005


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J U N E 2005Circuit Ideas:

16-way Clap-Operated Switch

Battery Charger with Automatic Switch-Off

Brake Failure Indicator

Multidoor Opening Alarm with IndicatorRechargeable Torch based on White LED

Safety Guard

Constructions:

Medium-Power Low-Cost Inverter

Programmable Timer Based on AT90S4433 AVR

J U L Y 2005

Circuit Ideas:

Dog Caller

Fuel Reserve Indicator For VehiclesIC 555 Timer Tester

Inexpensive Car Protection UnitSmart Cellphone Holder

White LED-Based Emergency Lamp and Turning Indicator

Constructions:

Computerised Electrical Equipment Control

Manual AT89C51 Programmer

A U G U S T 2 0 0 5

Circuit Ideas:

220V Live Wire Scanner

Light Dimmer That Doubles As VoltmeterMedium-Power FM Transmitter

Multicell Charger

Teleconferencing SystemTimer for Geyser

Constructions:

Digital Stopwatch

Remote-Controlled Stepper Motor

S E P T E M B E R 2 0 0 5

Circuit Ideas:

Doorbell-Cum-Visitor Indicator

Little Door Guard

Power Failure And Resumption AlarmSmart Switch

Stress Meter
http://efymagonline.com/showme.asp?id=1438&title=Stress%20Meter&issue=September2005http://efymagonline.com/showme.asp?id=1437&title=Smart%20Switch&issue=September2005http://efymagonline.com/showme.asp?id=1439&title=Power%20Failure%20And%20Resumption%20Alarm&issue=September2005http://efymagonline.com/showme.asp?id=1440&title=Little%20Door%20Guard&issue=September2005http://efymagonline.com/showme.asp?id=1436&title=Doorbell-Cum-Visitor%20Indicator&issue=September2005http://efymagonline.com/showme.asp?id=1418&title=Remote-Controlled%20Stepper%20Motor&issue=August2005http://efymagonline.com/showme.asp?id=1422&title=Digital%20Stopwatch&issue=August2005http://efymagonline.com/showme.asp?id=1428&title=Timer%20for%20Geyser%20&issue=August2005http://efymagonline.com/showme.asp?id=1425&title=Teleconferencing%20System%20&issue=August2005http://efymagonline.com/showme.asp?id=1427&title=Multicell%20Charger&issue=August2005http://efymagonline.com/showme.asp?id=1424&title=Medium-Power%20FM%20Transmitter&issue=August2005http://efymagonline.com/showme.asp?id=1426&title=Light%20Dimmer%20That%20Doubles%20As%20Voltmeter%20&issue=August2005http://efymagonline.com/showme.asp?id=1429&title=220V%20Live%20Wire%20Scanner%20&issue=August2005http://efymagonline.com/showme.asp?id=1403&title=Manual%20AT89C51%20Programmer&issue=July2005http://efymagonline.com/showme.asp?id=1404&title=Computerised%20Electrical%20Equipment%20Control&issue=July2005http://efymagonline.com/showme.asp?id=1397&title=White%20LED-Based%20Emergency%20Lamp%20and%20Turning%20Indicator&issue=July2005http://efymagonline.com/showme.asp?id=1400&title=Smart%20Cellphone%20Holder&issue=July2005http://efymagonline.com/showme.asp?id=1398&title=Inexpensive%20Car%20Protection%20Unit&issue=July2005http://efymagonline.com/showme.asp?id=1401&title=IC%20555%20Timer%20Tester&issue=July2005http://efymagonline.com/showme.asp?id=1402&title=Fuel%20Reserve%20Indicator%20For%20Vehicles&issue=July2005http://efymagonline.com/showme.asp?id=1399&title=Dog%20Caller&issue=July2005http://efymagonline.com/showme.asp?id=1385&title=Programmable%20Timer%20Based%20on%20AT90S4433%20AVR&issue=June2005http://efymagonline.com/showme.asp?id=1384&title=Medium-Power%20Low-Cost%20Inverter&issue=June2005http://efymagonline.com/showme.asp?id=1383&title=Safety%20Guard&issue=June2005http://efymagonline.com/showme.asp?id=1378&title=Rechargeable%20Torch%20based%20on%20White%20LED&issue=June2005http://efymagonline.com/showme.asp?id=1382&title=Multidoor%20Opening%20Alarm%20with%20Indicator&issue=June2005http://efymagonline.com/showme.asp?id=1380&title=Brake%20Failure%20Indicator&issue=June2005http://efymagonline.com/showme.asp?id=1381&title=Battery%20Charger%20with%20Automatic%20Switch-Off&issue=June2005http://efymagonline.com/showme.asp?id=1379&title=16-way%20Clap-Operated%20Switch&issue=June2005


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Constructions:

Audio Mixer with Multiple ControlsInfrared Interruption Counter

O C T O B E R 2 0 0 5

Circuit Ideas:Bicycle Guard

Digital Dice

Electronic FuseLiquid-Level Alarm

Remote-Controlled Power-Off Switch

Zener Value Evaluator

Constructions:

Noise-Muting FM Receiver

PC-Based Stepper Motor Controller

N O V E M B E R 2 0 0 5

Circuit Ideas:

Heat-Sensitive Switch

Sensitive Vibration Detector

Simple MOSFET-Based CFL

Simple Smoke DetectorTransistor Tester

Water-Tank Overflow Indicator

Constructions:

Automatic 3-Phase Induction Motor Starter

Using AVR Microcontrollers for ProjectsPart 1 of 3

D E C E M B E R 2 0 0 5

Circuit Ideas:

Automatic Washbasin Tap ControllerAutomatic-Off Timer For CD Players

Over-Speed Indicator

Soft SwitchVersatile Water-Level Controller

Constructions:

Speed Checker for HighwaysUsing AVR Microcontroller for ProjectsPart 2 of 3

J A N U A R Y 2006

Circuit Ideas:

Audio-Controlled Running Light

IR Burglar DeterrentRegulator For Battery Eliminator
http://efymagonline.com/showme.asp?id=1516&title=IR%20Burglar%20Deterrent&issue=January2006http://efymagonline.com/showme.asp?id=1516&title=IR%20Burglar%20Deterrent&issue=January2006http://efymagonline.com/showme.asp?id=1518&title=Audio-Controlled%20Running%20Light&issue=January2006http://efymagonline.com/showme.asp?id=1496&title=Using%20AVR%20Microcontroller%20for%20Projects%E2%80%94Part%202%20of%203&issue=December2005http://efymagonline.com/showme.asp?id=1494&title=Speed%20Checker%20for%20Highways&issue=December2005http://efymagonline.com/showme.asp?id=1502&title=Versatile%20Water-Level%20Controller&issue=December2005http://efymagonline.com/showme.asp?id=1497&title=Soft%20Switch&issue=December2005http://efymagonline.com/showme.asp?id=1501&title=Over-Speed%20Indicator&issue=December2005http://efymagonline.com/showme.asp?id=1498&title=Automatic-Off%20Timer%20For%20CD%20Players&issue=December2005http://efymagonline.com/showme.asp?id=1499&title=Automatic%20Washbasin%20Tap%20Controller&issue=December2005http://efymagonline.com/showme.asp?id=1483&title=Using%20AVR%20Microcontrollers%20for%20Projects%E2%80%94Part%201%20of%203&issue=November2005http://efymagonline.com/showme.asp?id=1482&title=Automatic%203-Phase%20Induction%20Motor%20Starter&issue=November2005http://efymagonline.com/showme.asp?id=1479&title=Water-Tank%20Overflow%20Indicator&issue=November2005http://efymagonline.com/showme.asp?id=1478&title=Transistor%20Tester&issue=November2005http://efymagonline.com/showme.asp?id=1480&title=Simple%20Smoke%20Detector&issue=November2005http://efymagonline.com/showme.asp?id=1476&title=Simple%20MOSFET-Based%20CFL&issue=November2005http://efymagonline.com/showme.asp?id=1481&title=Sensitive%20Vibration%20Detector&issue=November2005http://efymagonline.com/showme.asp?id=1477&title=Heat-Sensitive%20Switch&issue=November2005http://efymagonline.com/showme.asp?id=1462&title=PC-Based%20Stepper%20Motor%20Controller&issue=October2005http://efymagonline.com/showme.asp?id=1461&title=Noise-Muting%20FM%20Receiver&issue=October2005http://efymagonline.com/showme.asp?id=1460&title=Zener%20Value%20Evaluator&issue=October2005http://efymagonline.com/showme.asp?id=1459&title=Remote-Controlled%20Power-Off%20Switch&issue=October2005http://efymagonline.com/showme.asp?id=1458&title=Liquid-Level%20Alarm&issue=October2005http://efymagonline.com/showme.asp?id=1455&title=Electronic%20Fuse&issue=October2005http://efymagonline.com/showme.asp?id=1456&title=Digital%20Dice&issue=October2005http://efymagonline.com/showme.asp?id=1457&title=Bicycle%20Guard&issue=October2005http://efymagonline.com/showme.asp?id=1441&title=Infrared%20Interruption%20Counter&issue=September2005http://efymagonline.com/showme.asp?id=1442&title=Audio%20Mixer%20with%20Multiple%20Controls&issue=September2005


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Remote Emergency Alarm For Unmanned Lifts

Shadow AlarmTachometer

Constructions:

A Simple Directional Detector/Counter

Using AVR Microcontroller for ProjectsPart 3 of 3

F E B R U A R Y 2006

Circuit Ideas:

Capacitor Evaluator

FM Adaptor for Car Stereo

Panic PlatePower Supply Reversal Correcter-Cum-Preventer

Ultrasonic Proximity Detector

Versatile Power Supply

Constructions:

Low-Cost LCD Frequency Meter

PC-Based Transistor-Lead Identifier

M A R C H 2006

Circuit Ideas:

Electronic DiceInfrared Bug

Mains Supply Failure Backup Light

Picnic LampSimple Transistor Type and Lead Identifier

Twinkle Twinkle XMas Star

Constructions:

AT89C2051-Based Countdown Timer

PC-Based Remote-Controlled Stepper Motor

A P R I L 2006

Circuit Ideas:

Car Porch Guard

Logic High/Low Indicator

Simple Short-Wave Transmitter

Solar Lighting System

Solidstate Relay

Constructions:

Automatic Rain Timer

Power Factor Correction
http://efymagonline.com/showme.asp?id=1575&title=Power%20Factor%20Correction&issue=April2006http://efymagonline.com/showme.asp?id=1574&title=Automatic%20Rain%20Timer&issue=April2006http://efymagonline.com/showme.asp?id=1572&title=Solidstate%20Relay&issue=April2006http://efymagonline.com/showme.asp?id=1571&title=Solar%20Lighting%20System&issue=April2006http://efymagonline.com/showme.asp?id=1569&title=Simple%20Short-Wave%20Transmitter&issue=April2006http://efymagonline.com/showme.asp?id=1573&title=Logic%20%E2%80%98High%E2%80%99/%E2%80%98Low%E2%80%99%20Indicator&issue=April2006http://efymagonline.com/showme.asp?id=1570&title=Car%20Porch%20Guard&issue=April2006http://efymagonline.com/showme.asp?id=1558&title=PC-Based%20Remote-Controlled%20Stepper%20Motor&issue=March2006http://efymagonline.com/showme.asp?id=1557&title=AT89C2051-Based%20Countdown%20Timer&issue=March2006http://efymagonline.com/showme.asp?id=1556&title=Twinkle%20Twinkle%20X%E2%80%99Mas%20Star&issue=March2006http://efymagonline.com/showme.asp?id=1553&title=Simple%20Transistor%20Type%20and%20Lead%20Identifier&issue=March2006http://efymagonline.com/showme.asp?id=1552&title=Picnic%20Lamp&issue=March2006http://efymagonline.com/showme.asp?id=1554&title=Mains%20Supply%20Failure%20Backup%20Light&issue=March2006http://efymagonline.com/showme.asp?id=1551&title=Infrared%20Bug&issue=March2006http://efymagonline.com/showme.asp?id=1555&title=Electronic%20Dice&issue=March2006http://efymagonline.com/showme.asp?id=1537&title=PC-Based%20Transistor-Lead%20Identifier&issue=February2006http://efymagonline.com/showme.asp?id=1538&title=Low-Cost%20LCD%20Frequency%20Meter&issue=February2006http://efymagonline.com/showme.asp?id=1531&title=Versatile%20Power%20Supply&issue=February2006http://efymagonline.com/showme.asp?id=1536&title=Ultrasonic%20Proximity%20Detector&issue=February2006http://efymagonline.com/showme.asp?id=1534&title=Power%20Supply%20Reversal%20Correcter-Cum-Preventer&issue=February2006http://efymagonline.com/showme.asp?id=1532&title=Panic%20Plate&issue=February2006http://efymagonline.com/showme.asp?id=1533&title=FM%20Adaptor%20for%20Car%20Stereo&issue=February2006http://efymagonline.com/showme.asp?id=1535&title=Capacitor%20Evaluator&issue=February2006http://efymagonline.com/showme.asp?id=1514&title=Using%20AVR%20Microcontroller%20for%20Projects%E2%80%94Part%203%20of%203%20&issue=January2006http://efymagonline.com/showme.asp?id=1513&title=A%20Simple%20Directional%20Detector/Counter%20&issue=January2006http://efymagonline.com/showme.asp?id=1520&title=Tachometer&issue=January2006http://efymagonline.com/showme.asp?id=1515&title=Shadow%20Alarm&issue=January2006http://efymagonline.com/showme.asp?id=1517&title=Remote%20Emergency%20Alarm%20For%20Unmanned%20Lifts&issue=January2006


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M A Y 2006

Circuit Ideas:

Anti-Sleep Alarm

DC Changeover System with Battery Protection Unit

Farmhouse Lantern-Cum-Flasher

School/College Quiz BuzzerVisual AC Mains Voltage Indicator

Constructions:

3D Surround Sound System

AVR Microcontroller-Based Clock

J U N E 2006

Circuit Ideas:

Door Guard

Easy Transistor Tester

Multi-Melody Generator With Instrumental EffectMultipurpose Listening Device

Parrot-Sounding AC Doorbell

Constructions:

Fastest-Finger-First Using Microcontroller

Remote-Controlled Land RoverA DIY Robotic Project

J U L Y 2006

Circuit Ideas:

Briefcase Alarm

Doorbell

Low-Cost Night Lamp

Low-Power Voltage DoublerRemote-Controlled Fan Regulator

Constructions:

Microcontroller-based Triggering Circuit for SCR Phase Control

Parallel-Port Testing and Programming Aid

A U G U S T 2 0 0 6

Circuit Ideas:

A Fourth-Order Speech Filter (Based on Texas Instruments Application Note)

Hearing AidMicro-Power Flasher

Speed Control of DC Motor Using Pulse-Width Modulation

Touch-Plate doorbell
http://efymagonline.com/showme.asp?id=1660&title=Touch-Plate%20doorbell&issue=August2006http://efymagonline.com/showme.asp?id=1657&title=Speed%20Control%20of%20DC%20Motor%20Using%20Pulse-Width%20Modulation&issue=August2006http://efymagonline.com/showme.asp?id=1659&title=Micro-Power%20Flasher&issue=August2006http://efymagonline.com/showme.asp?id=1656&title=Hearing%20Aid&issue=August2006http://efymagonline.com/showme.asp?id=1658&title=A%20Fourth-Order%20Speech%20Filter%20%28Based%20on%20Texas%20Instruments%20Application%20Note%29&issue=August2006http://efymagonline.com/showme.asp?id=1638&title=Parallel-Port%20Testing%20and%20Programming%20Aid&issue=July2006http://efymagonline.com/showme.asp?id=1639&title=Microcontroller-based%20Triggering%20Circuit%20for%20SCR%20Phase%20Control&issue=July2006http://efymagonline.com/showme.asp?id=1633&title=Remote-Controlled%20Fan%20Regulator&issue=July2006http://efymagonline.com/showme.asp?id=1636&title=Low-Power%20Voltage%20Doubler&issue=July2006http://efymagonline.com/showme.asp?id=1635&title=Low-Cost%20Night%20Lamp&issue=July2006http://efymagonline.com/showme.asp?id=1637&title=Doorbell&issue=July2006http://efymagonline.com/showme.asp?id=1634&title=Briefcase%20Alarm&issue=July2006http://efymagonline.com/showme.asp?id=1611&title=Remote-Controlled%20Land%20Rover%E2%80%94A%20DIY%20Robotic%20Project&issue=June2006http://efymagonline.com/showme.asp?id=1612&title=Fastest-Finger-First%20Using%20Microcontroller&issue=June2006http://efymagonline.com/showme.asp?id=1618&title=Parrot-Sounding%20AC%20Doorbell&issue=June2006http://efymagonline.com/showme.asp?id=1622&title=Multipurpose%20Listening%20Device&issue=June2006http://efymagonline.com/showme.asp?id=1619&title=Multi-Melody%20Generator%20With%20Instrumental%20Effect&issue=June2006http://efymagonline.com/showme.asp?id=1620&title=Easy%20Transistor%20Tester&issue=June2006http://efymagonline.com/showme.asp?id=1621&title=Door%20Guard&issue=June2006http://efymagonline.com/showme.asp?id=1591&title=AVR%20Microcontroller-Based%20Clock&issue=May2006http://efymagonline.com/showme.asp?id=1590&title=3D%20Surround%20Sound%20System&issue=May2006http://efymagonline.com/showme.asp?id=1595&title=Visual%20AC%20Mains%20Voltage%20Indicator&issue=May2006http://efymagonline.com/showme.asp?id=1594&title=School/College%20Quiz%20Buzzer&issue=May2006http://efymagonline.com/showme.asp?id=1596&title=Farmhouse%20Lantern-Cum-Flasher&issue=May2006http://efymagonline.com/showme.asp?id=1598&title=DC%20Changeover%20System%20with%20Battery%20Protection%20Unit&issue=May2006http://efymagonline.com/showme.asp?id=1597&title=Anti-Sleep%20Alarm&issue=May2006


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Constructions:

Auto Switch for TVMicrocontroller-based Code Lock

S E P T E M B E R 2 0 0 6

Circuit Ideas:Bell-Cum Light Controller

Electronic Ludo

Fastest-Finger-FirstFriendly Charger for Mobile Phones

IR-to-RF Converter

Constructions:

Digital Weight Accumulator

Remotely Programmable RTC-Interfaced Microcontroller for Multiple Device Control

O C T O B E R 2 0 0 6Circuit Ideas:

Bodmas RuleFront Door Guard

Infrared Toggle Switch

Optical Remote On/Off Switch

Smart Battery Protector Using a Shunt RegulatorTelephone-Operated Calling System

Constructions:

Beverage Vending Machine Controller

Digital Thermometer-cum-Controller

N O V E M B E R 2 0 0 6

Circuit Ideas:

Appliance Timer-Cum-Clap Switch

Optical Smoke DetectorPhotodiode-Based Fire Detector

Sensitive AM Transmitter

Variable Power Supply Using a Fixed-Voltage Regulator IC

Constructions:

Quiz Buzzer

Stepper Motor Controller Using AT89C51

D E C E M B E R 2 0 0 6

Circuit Ideas:

Capacitance-Multiplier Power SupplyDigital Counter

Electronic Door Key
http://efymagonline.com/showme.asp?id=1738&title=Electronic%20Door%20Key&issue=December2006http://efymagonline.com/showme.asp?id=1737&title=Digital%20Counter&issue=December2006http://efymagonline.com/showme.asp?id=1736&title=Capacitance-Multiplier%20Power%20Supply&issue=December2006http://efymagonline.com/showme.asp?id=1720&title=Stepper%20Motor%20Controller%20Using%20AT89C51&issue=November2006http://efymagonline.com/showme.asp?id=1719&title=Quiz%20Buzzer&issue=November2006http://efymagonline.com/showme.asp?id=1715&title=Variable%20Power%20Supply%20Using%20a%20Fixed-Voltage%20Regulator%20IC&issue=November2006http://efymagonline.com/showme.asp?id=1716&title=Sensitive%20AM%20Transmitter&issue=November2006http://efymagonline.com/showme.asp?id=1714&title=Photodiode-Based%20Fire%20Detector&issue=November2006http://efymagonline.com/showme.asp?id=1718&title=Optical%20Smoke%20Detector&issue=November2006http://efymagonline.com/showme.asp?id=1717&title=Appliance%20Timer-Cum-Clap%20Switch&issue=November2006http://efymagonline.com/showme.asp?id=1699&title=Digital%20Thermometer-cum-Controller&issue=October2006http://efymagonline.com/showme.asp?id=1700&title=Beverage%20Vending%20Machine%20Controller&issue=October2006http://efymagonline.com/showme.asp?id=1693&title=Telephone-Operated%20Calling%20System&issue=October2006http://efymagonline.com/showme.asp?id=1698&title=Smart%20Battery%20Protector%20Using%20a%20Shunt%20Regulator&issue=October2006http://efymagonline.com/showme.asp?id=1697&title=Optical%20Remote%20On/Off%20Switch&issue=October2006http://efymagonline.com/showme.asp?id=1696&title=Infrared%20Toggle%20Switch&issue=October2006http://efymagonline.com/showme.asp?id=1695&title=Front%20Door%20Guard&issue=October2006http://efymagonline.com/showme.asp?id=1694&title=Bodmas%20Rule&issue=October2006http://efymagonline.com/showme.asp?id=1679&title=Remotely%20Programmable%20RTC-Interfaced%20Microcontroller%20for%20Multiple%20Device%20Control&issue=September2006http://efymagonline.com/showme.asp?id=1680&title=Digital%20Weight%20Accumulator&issue=September2006http://efymagonline.com/showme.asp?id=1678&title=IR-to-RF%20Converter&issue=September2006http://efymagonline.com/showme.asp?id=1675&title=Friendly%20Charger%20for%20Mobile%20Phones&issue=September2006http://efymagonline.com/showme.asp?id=1676&title=Fastest-Finger-First&issue=September2006http://efymagonline.com/showme.asp?id=1677&title=Electronic%20Ludo&issue=September2006http://efymagonline.com/showme.asp?id=1674&title=Bell-Cum%20Light%20Controller&issue=September2006http://efymagonline.com/showme.asp?id=1661&title=Microcontroller-based%20Code%20Lock&issue=August2006http://efymagonline.com/showme.asp?id=1662&title=Auto%20Switch%20for%20TV&issue=August2006


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Secret Bell

Ultrasonic Proximity Detector

Constructions:

Microcontroller-based Automatic Flush System

Two-Channel PC-based Oscilloscope

J A N U A R Y 2007

Circuit Ideas:

Electronic Horn

IR Music Transmitter and Receiver

IR Proximity Detector SwitchLocker Guard

Simple Message Display System

Constructions:

Digital Phase SelectorMicrocontroller-based Bidirectional Visitor Counter

F E B R U A R Y 2 0 0 7

Circuit Ideas:

Clock Timer

Fully Automatic Emergency LightLight-Operated Doorbell

Simple Automatic Water-Level Controller

Simple HF Power Amplifier

Constructions:

8085 Emulator Using C++

PIC16F84-based Digital ThermometerSource Code

source code (.bas file)

Water-level Controller-cum-motor Protector

M A R C H 2 0 0 7

Circuit Ideas:

3V PC Adaptor

Automatic Emergency Light

Digital Thermometer

Low-Cost Battery ChargerStreet Light Controller

Constructions:

Auto Controller for Petrol-Run Power GeneratorDesign Your Own Infrared Remote
http://efymagonline.com/showme.asp?id=1805&title=Design%20Your%20Own%20Infrared%20Remote&issue=March2007http://efymagonline.com/showme.asp?id=1806&title=Auto%20Controller%20for%20Petrol-Run%20Power%20Generator&issue=March2007http://efymagonline.com/showme.asp?id=1800&title=Street%20Light%20Controller&issue=March2007http://efymagonline.com/showme.asp?id=1804&title=Low-Cost%20Battery%20Charger&issue=March2007http://efymagonline.com/showme.asp?id=1801&title=Digital%20Thermometer&issue=March2007http://efymagonline.com/showme.asp?id=1802&title=Automatic%20Emergency%20Light&issue=March2007http://efymagonline.com/showme.asp?id=1803&title=3V%20PC%20Adaptor&issue=March2007http://efymagonline.com/showme.asp?id=1785&title=Water-level%20Controller-cum-motor%20Protector&issue=February2007http://efymagonline.com/showme.asp?id=1798&title=source%20code%20%28.bas%20file%29&issue=February2007http://efymagonline.com/showme.asp?id=1795&title=Source%20Code&issue=February2007http://efymagonline.com/showme.asp?id=1784&title=PIC16F84-based%20Digital%20Thermometer&issue=February2007http://efymagonline.com/showme.asp?id=1791&title=8085%20Emulator%20Using%20%E2%80%98C++%E2%80%99&issue=February2007http://efymagonline.com/showme.asp?id=1782&title=Simple%20HF%20Power%20Amplifier&issue=February2007http://efymagonline.com/showme.asp?id=1780&title=Simple%20Automatic%20Water-Level%20Controller&issue=February2007http://efymagonline.com/showme.asp?id=1781&title=Light-Operated%20Doorbell&issue=February2007http://efymagonline.com/showme.asp?id=1783&title=Fully%20Automatic%20Emergency%20Light&issue=February2007http://efymagonline.com/showme.asp?id=1779&title=Clock%20Timer&issue=February2007http://efymagonline.com/showme.asp?id=1759&title=Microcontroller-based%20Bidirectional%20Visitor%20Counter&issue=January2007http://efymagonline.com/showme.asp?id=1760&title=Digital%20Phase%20Selector&issue=January2007http://efymagonline.com/showme.asp?id=1758&title=Simple%20Message%20Display%20System&issue=January2007http://efymagonline.com/showme.asp?id=1756&title=Locker%20Guard&issue=January2007http://efymagonline.com/showme.asp?id=1757&title=IR%20Proximity%20Detector%20Switch&issue=January2007http://efymagonline.com/showme.asp?id=1754&title=IR%20Music%20Transmitter%20and%20Receiver&issue=January2007http://efymagonline.com/showme.asp?id=1755&title=Electronic%20Horn&issue=January2007http://efymagonline.com/showme.asp?id=1740&title=Two-Channel%20PC-based%20Oscilloscope&issue=December2006http://efymagonline.com/showme.asp?id=1741&title=Microcontroller-based%20Automatic%20Flush%20System&issue=December2006http://efymagonline.com/showme.asp?id=1735&title=Ultrasonic%20Proximity%20Detector&issue=December2006http://efymagonline.com/showme.asp?id=1739&title=Secret%20Bell&issue=December2006


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A P R I L 2 0 0 7

Circuit Ideas:

Accurate 1Hz Generator

Circuit for UPS To Hybernate PC

Electronic Reminder

LED Illumination for RefrigeratorsSolar-Powered Pedestal Lighting System

Constructions:

Microcontroller-based Infrared Tracking Robot

Remote-Controlled Real-Time Clock with Device Controller

M A Y 2 0 0 7

Circuit Ideas:

5-Band Graphic Equaliser

Auto Muting During Telephonic Conversation

Automatic Wash Basin Mirror Lamp ControllerIR Remote On/Off Switch

MAT Switch

Constructions:

PC-based Dual DC Motor Controller

Wireless Messaging Via Mobile/Landline Phone

J U N E 2 0 0 7

Circuit Ideas:

Anti-Collision Rear Light

Automatic Darkness-Controlled Lighting System

Contactless Telephone Finger

Light FenceUSB-Powered Desktop Lamp

Constructions:

Microcontroller-based Industrial Timer

Standalone Digital Clock

J U L Y 2 0 0 7

Circuit Ideas:

Anti-Theft Alarm

Automatic Phase ChangerDiac-Controlled Flasher

Flying Saucer

Preset Off Timer
http://efymagonline.com/showme.asp?id=1879&title=Preset%20%E2%80%98Off%E2%80%99%20Timer&issue=July2007http://efymagonline.com/showme.asp?id=1882&title=Flying%20Saucer&issue=July2007http://efymagonline.com/showme.asp?id=1880&title=Diac-Controlled%20Flasher&issue=July2007http://efymagonline.com/showme.asp?id=1881&title=Automatic%20Phase%20Changer&issue=July2007http://efymagonline.com/showme.asp?id=1878&title=Anti-Theft%20Alarm&issue=July2007http://efymagonline.com/showme.asp?id=1863&title=Standalone%20Digital%20Clock&issue=June2007http://efymagonline.com/showme.asp?id=1862&title=Microcontroller-based%20Industrial%20Timer&issue=June2007http://efymagonline.com/showme.asp?id=1859&title=USB-Powered%20Desktop%20Lamp&issue=June2007http://efymagonline.com/showme.asp?id=1858&title=Light%20Fence&issue=June2007http://efymagonline.com/showme.asp?id=1860&title=Contactless%20Telephone%20Finger&issue=June2007http://efymagonline.com/showme.asp?id=1861&title=Automatic%20Darkness-Controlled%20Lighting%20System&issue=June2007http://efymagonline.com/showme.asp?id=1857&title=Anti-Collision%20Rear%20Light&issue=June2007http://efymagonline.com/showme.asp?id=1845&title=Wireless%20Messaging%20Via%20Mobile/Landline%20Phone&issue=May2007http://efymagonline.com/showme.asp?id=1844&title=PC-based%20Dual%20DC%20Motor%20Controller&issue=May2007http://efymagonline.com/showme.asp?id=1841&title=MAT%20Switch&issue=May2007http://efymagonline.com/showme.asp?id=1840&title=IR%20Remote%20On/Off%20Switch&issue=May2007http://efymagonline.com/showme.asp?id=1842&title=Automatic%20Wash%20Basin%20Mirror%20Lamp%20Controller&issue=May2007http://efymagonline.com/showme.asp?id=1839&title=Auto%20Muting%20During%20Telephonic%20Conversation&issue=May2007http://efymagonline.com/showme.asp?id=1838&title=5-Band%20Graphic%20Equaliser&issue=May2007http://efymagonline.com/showme.asp?id=1824&title=Remote-Controlled%20Real-Time%20Clock%20with%20Device%20Controller&issue=April2007http://efymagonline.com/showme.asp?id=1825&title=Microcontroller-based%20Infrared%20Tracking%20Robot&issue=April2007http://efymagonline.com/showme.asp?id=1821&title=Solar-Powered%20Pedestal%20Lighting%20System&issue=April2007http://efymagonline.com/showme.asp?id=1822&title=LED%20Illumination%20for%20Refrigerators&issue=April2007http://efymagonline.com/showme.asp?id=1819&title=Electronic%20Reminder&issue=April2007http://efymagonline.com/showme.asp?id=1823&title=Circuit%20for%20UPS%20To%20Hybernate%20PC&issue=April2007http://efymagonline.com/showme.asp?id=1820&title=Accurate%201Hz%20Generator&issue=April2007


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Constructions:

Digital VoltmeterMicrocontroller-based Graphics Display

A U G U S T 2 0 0 7

Circuit Ideas:Audible Continuity Tester

Corrosion-Free Water-Level Indicator

Infrared Firecracker IgniterMobile Shield

PC Table Lamp

Simple Electronic Dice

Constructions:

PC-based Automatic Time Manager

Stepper Motor Control Using VC++

S E P T E M B E R 2 0 0 7

Circuit Ideas:

On/Off Ringer

Desktop Power Supply

PC Temperature Alarm

Shutter GuardVoltage Doubler

Constructions:

Energy Saver for Welding Transformer

Interfacing a Graphics LCD with the Microcontroller

O C T O B E R 2 0 0 7

Circuit Ideas:

5V/12V Supply From PC

Infrared Burglar AlarmLaptop Protector

Motorbike Alarm

Stablised Power Supply For Prototyping

Constructions:

Digital Heart-Beat Counter

Secured Room Access System

N O V E M B E R 2 0 0 7

Circuit Ideas:

Audible IR Proximity DetectorDice With 7-Segment Display

Magic Lamp
http://efymagonline.com/showme.asp?id=1963&title=Magic%20Lamp&issue=November2007http://efymagonline.com/showme.asp?id=1966&title=Dice%20With%207-Segment%20Display&issue=November2007http://efymagonline.com/showme.asp?id=1965&title=Audible%20IR%20Proximity%20Detector&issue=November2007http://efymagonline.com/showme.asp?id=1945&title=Secured%20Room%20Access%20System&issue=October2007http://efymagonline.com/showme.asp?id=1946&title=Digital%20Heart-Beat%20Counter&issue=October2007ht

efy project list.205105631

Documents