capacimetro e inductometro (medidor lc)
TRANSCRIPT
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LC Meter DIY KitLC Meter DIY KitLC Meter DIY KitLC Meter DIY Kitby Phil Rice VK3BHRby Phil Rice VK3BHRby Phil Rice VK3BHRby Phil Rice VK3BHR
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Components List:Components List:Components List:Components List:
Resistors:Resistors:Resistors:Resistors:
R1 5% Carbon Film Resistor 3K (orange, black, red, gold)
R2, R3, R4 5% Carbon Film Resistor 100K (brown, black, yellow, gold)
R5 5% Carbon Film Resistor 20K (red, black, orange, gold)
R6 5% Carbon Film Resistor 47K (yellow, violet, orange, gold)
R7, R8 5% Carbon Film Resistor 4.7K (yellow, violet, red, gold)
R9, R10, R11, R12 5% Carbon Film Resistor 1K (brown, black, red, gold)
R13 5% Carbon Film Resistor 36R (orange, blue, black, gold)
P1 10K Potentiometer Trimmer (103)
Capacitors:Capacitors:Capacitors:Capacitors:
C1, C7, C11, C12 100nF Multilayer Ceramic Capacitor (104)
C2 220uF Electrolytic Capacitor 16V
C4 100uF or 220uF Electrolytic Capacitor 10V
C3, C6 1nF 5% Polyester Film Box Capacitor (102)
C5, C8 10uF Tantalum Capacitor
C13, C14 30pF Multilayer Ceramic Capacitor (300)
Inductors:Inductors:Inductors:Inductors:
L1 100uH Radial Inductor
Semiconductors:Semiconductors:Semiconductors:Semiconductors:
T1 2N3906 PNP Transistor
PIC16F628A Micro-controller flashed with hex
LM7805 5V Positive Voltage Regulator
D1 1N4007 Diode
D2 1N4148 Diode
LED 3mm Red
Other:Other:Other:Other:
LCD 16x2 HD44780 Compatible
5V Relay
4.000 MHz Crystal
S1 Slide Switch Button On/Off
S2 Tact Push Button Zero
S3 DPDT Push Button C/L
18 Pin IC Socket
12 Pins Male Header 21mm (6+6)
2 Pins Male Header
2 Pins Single Male Header Right Angle
8 Pins Double Male Header Right Angle
6 Pins Female Header DIP SIP Adapter
2.54 mm Jumper Cup
2x 15mm M2.5 Standoff
4x M2.5 Screw
4x M3 Screw
4x M3 Standoff
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Technical Specifications:Technical Specifications:Technical Specifications:Technical Specifications:
Capacitors Measuring Range: 0.1pF to 0.1uF
Inductance Measuring Range: 0.01uH to 20mH
Accuracy: 1%
Supply Voltage: 9V regulated DC
Supply Current: 63mA
Software Calibration with a good external capacitor.
Compact PCB Design
Dimensions: 50 x 85 x 35 mm
Background:Background:Background:Background:The original circuit and hex file was developed by Phil Rice VK3BHR. You can find more
information about this open source project at his website:
https://sites.google.com/site/vk3bhr/home
I would say many thanks to him for the LC Meter circuit and hex because I use it at my home
lab more than 2 years with many different projects. I designed my own PCB and produced DIY
kits to help others ham's like me to build this good LC Meter at home. The kit should be used
with 9V 200mA regulated power supply and not with 9V battery! It has high power
consumption (about 63mA) because of the relay type I used and LCD backlight.
The assembling process require solder skills. Full kit soldering with calibration can take a
hour or two if you are beginner in electronics. So please take your time, print the circuit page
and put in in front of your eyes during soldering. The PCB has silkscreen with components
numbers. It always hard to unsolder components if you made a mistake, that's why I advise
double check every component and it's direction before you'll solder it to the PCB. All
components are through-hole and are easy to solder.
Calibration process is simple. It will be described later in the manual. You will need some
precision capacitor with 1% accuracy.
The kit can be used without enclosure, but you can use any small size plastic box for this
project. The PCB has 2 pins for external probes connection. Solder your probes terminals with
short wires to this pins.
The LCD color of the kit is random. Usually I'll send you Blue Color, depend on stock. Any
HD44780 compatible 16x1 or 16x2 display will work fine.
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Assembling and Soldering:Assembling and Soldering:Assembling and Soldering:Assembling and Soldering:
Remember do clean solder work and install right components in the right place, because it
always hard to unsolder the components from the PCB. We cannot be responsible if you'll
overheat your PCB or will damage the kit components during wrong soldering with a
mistakes. So please double check yourself before you solder. Remember to use a solder with
Rosin Core Flux. Some industrial flux has several Mega-ohms resistance and they require a
special cleaning that cannot be performed at home.
Do not use too much solder. A good joint should look like:
Extra flux can be cleaned after with soft brush and medical alcohol. We advice you to use
0.8mm or 1.00mm thickness solder wire with low melt point:
60/40 186 Celsius (386 Fahrenheit)
63/37 183 Celsius (361 Fahrenheit)
If you'll need to remove excess solder from the pad, use desoldering tools (braid wick or small
pump).
Start your soldering with horizontal components, i.e. resistors, diodes, IC socket, crystal etc.
Fill with a solder 10 PCB links pads (there is 2 links close to C4 on the photo you can see and
their pads are filled with solder).
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Remember about tantalum and electrolytic caps polarity!
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Put special attention to PIC chip direction! There is the finished PCB before LCD connection:
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Double row right angle pins should be installed in up-side down position. This pins are used
for calibration and internal oscillator frequency control.
Hardware installation: use 4x M3 standoffs for PCB and 2x M2.5 standoffs for LCD board.
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Trim the P1 potentiometer as in the photo before you'll connect the LCD. P1 control LCD
contrast. You can recalibrate it a little with a small pliers when the LCD is installed, but do it
carefully!
The finished LC Meter kit with LCD installed:
Please do not solder the LCD if you still not checked that the kit is power up without any
problem. You can gentle push forward the LCD board to provide good contact between LCD
board and 6+6 pins. Solder the LCD board later after you will end all calibration and testing
process.
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Connect 9V power supply. Never just wrap a simple wires over the voltage pins. Use only
2.54 mm red and black jumper wires for PSU connection!
The display will say Calibrating and C=0.0pF if the device in capacitance range. Press S2
zero button before measuring. You can toggle S3 DPDT button any time for selecting between
capacitance or inductance range.
Close L/C jumper when in inductance range and press S2 zero button. Remove L/C jumper
before measuring coils. The display will say Over Range when no coil is connected.
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Oscillator Frequency:Oscillator Frequency:Oscillator Frequency:Oscillator Frequency:
Connect pin 8 of the PIC to the ground with JMP 2. You should see the oscillator frequency on
the display 50000 +/- 10%
If you'll connect pin 9 of the PIC to ground with JMP 1 you should be near to 71% +/- 5% of
your 50000 +/- 10% frequency.
If you got similar values displayed it mean your LC Meter is soldered and work properly. If not,
please check your soldering.
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Calibration:Calibration:Calibration:Calibration:
Connect a good 1% capacitor and adjust the readings with JMP3 and JMP4. When you put
jumper cup on JMP3 or JMP4 contacts it will slowly lower or raise the capacitance reading. You
can use any 1% cap from 100pF to 10nF. When you calibrate the capacitance, the inductance
will be calibrated by auto. You can re-calibrate your device again in any time you'll need.
Support request requirements:Support request requirements:Support request requirements:Support request requirements:
Send your request to [email protected] Please describe your problem,
attach screenshots or pictures and tell what you already tried to do for resolving the
problem.
Attach two clear focused photos of your soldered kit, from both sides of the PCB.
Please wait up to 24 hours for the response.
Please follow our support instruction because we can help you only if you'll work with
support team. If you'll not provide a information for support team we'll not be able to
resolve the problem.
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