super simple ipod fm transmitter _ make

8/18/2019 Super Simple iPod FM Transmitter _ Make

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MAKE: PROJECTS

Super Simple iPod FM TransmitterBy Sean Michael Ragan Dif⸀culty: Dif⸀cult

Weekend Projects - Super Simple FM Transmitter

https://www.youtube.com/watch?v=MMgzUGBfXiEhttps://www.youtube.com/watch?v=MMgzUGBfXiEhttps://www.youtube.com/watch?v=MMgzUGBfXiEhttps://www.youtube.com/watch?v=MMgzUGBfXiEhttp://makezine.com/author/seanmichaelragan/http://makezine.com/projects/super-simple-fm-transmitter/http://makezine.com/projects/http://pixel.mathtag.com/click/img?mt_aid=1643429314558179597&mt_id=2288354&mt_adid=111878&mt_sid=1162012&mt_exid=4&mt_inapp=0&mt_uuid=5317ce99-215d-c28d-8f7c-5f1e08df92e3&mt_3pck=https%3A//adclick.g.doubleclick.net/aclk%3Fsa%3Dl%26ai%3DCBBs0DXTxVsqoH8iamATHlbSwDPSM5tkElN3W_XfAjbcBEAEgAGCFA4IBF2NhLXB1Yi04NzAwMjczODgyMzAxNTE5oAHg6pnsA8gBCeACAKgDAaoEuQFP0KcQb-Me5iMB1mmQNDAbe0DiX06QXP-5R1R5ZZVdGn0lDAzmFwYNcP6AN3EDPKawE5kdpfEUVY99kmChySK6ZaiV8_vw1zp5lQovyq289mcjypBZ1qNebh5Tc1-5h7ZRdXB4QX2b7ifcLJzy-_84EJPLgnVigC610tT3i62VKRVEeYthSV3PzH79RpPdKuHhmDJecxgDxn5OZO0drlBM3_m60mWwGh6gC5WeWPzUFMAZAtUNQl8HFeAEAYAGoLzOkqHLz8yZAaAGIdgHAA%26num%3D1%26sig%3DAOD64_1nJIXL2hinf9TnhC-r4KTIUhorNg%26client%3Dca-pub-8700273882301519%26adurl%3D&mt_lp=http%3A//www.tek.com/&redirect=https://servedby.flashtalking.com/click/3/57812;1645813;1286386;210;0/?ft_impID=300383B41A5572&g=2541511C7C68BF&random=673373593&ft_width=728&ft_height=90&url=http://info.tek.com/www-revolutioneer-ad.html?utm_source=jmpbp&utm_medium=display&utm_content=brand&utm_campaign=revolutioneer


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FM transmitters can be complicated to build, but not this one — this iPod FM transmitte

about the easiest you can possibly make. And though the science of radio is well

understood, there’s a magical, emotional quality about it that we don’t often stop to

appreciate. You will not forget the ⸀rst time you pick up a transmission broadcast from

device you soldered together, yourself, from a few bits of copper, carbon, plastic, and wi

am indebted to Jim and Kat of Sonodrome for ⸀rst introducing me to that experience,

hrough this very circuit, which I 䂅rst built on a pre-etched PCB from a kit they offered fosale as recently as 2011.

This design was originally popularized by Japanese multimedia artist Tetsuo Kogawa. T

circuit itself is a slight variation on Kogawa’s simplest FM transmitter design, and the

method of building it is sometimes referred to as “Manhattan style.” It uses a piece of

copper-clad circuit board but, rather than etching the circuit traces through the copper

ayer, a large piece of continuously-plated board is used to make all the circuit’s ground

connections, and small sections of plated board are glued to the surface to form nodes pads” that are insulated from ground. Besides being a convenient way to assemble

circuits using minimal tools, this building method encourages you to think about circuits

an interesting way — as groups of connections that are either grounded or “漀oating abov

ground.

This transmitter uses ten on-board components and will transmit a monaural audio sign

about 30 feet. It is possible to extend that range by adding an antenna, and Mr. Kogawa’

website has more information about how to do that.

202

44

41

2

2

http://www.translocal.jp/radio/micro/howtomakeantenna.htmlhttp://www.translocal.jp/radio/micro/howtosimplestTX.htmlhttp://www.translocal.jp/radio/micro/howtotx.htmlhttp://makezine.com/2011/04/15/make-projects-micro-fm-transmitter/http://www.sonodrome.co.uk/


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PARTS

FM Radio Receiver RadioShack #12-

586Transistor, NPN, 2N3904 RadioShack

#276-2016

Battery clip, 9V RadioShack #270-324

Phone plug, mono, 1/8" RadioShack

#274-286

Stranded copper wire, 22 gauge, red

and black RadioShack #278-1218

Capacitor, ceramic disk, 0.01μF (2)

RadioShack #272-131

NOTE: Depending on where you live, operating an FM transmitter — even a very short-

ange one like this — may be illegal without a license. Unless you attach an antenna, it’s

very unlikely that anyone will notice or complain about any transmissions you may make

with this device. On the other hand, it’s very dif⸀cult to predict, before construction iscomplete, just where on the FM band this transmitter will broadcast. Use due caution

during testing, and make sure you understand the law in your area before attaching the

battery.

http://www.radioshack.com/product/index.jsp?productId=2062363http://www.radioshack.com/product/index.jsp?productId=2036275http://makezine.com/projects/super-simple-fm-transmitter/http://www.radioshack.com/product/index.jsp?productId=2062218http://www.radioshack.com/product/index.jsp?productId=2062609http://www.radioshack.com/product/index.jsp?productId=3705831


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Capacitor, ceramic disk, 10pF (2) from

RadioShack #272-801

Battery, 9V, rechargeable Ni-MH, or

alkaline RadioShack #23-748 or #23-

853

Solid copper wire, 18 gauge, 4" length

RadioShack #278-1223

Hook-and-loop strips RadioShack #64-2363

Resistors, 1/4W (3) 1 each: 470Ω, 10K,

and 27K, from RadioShack #271-0312

Copper-clad board, about 5cm × 5cm

RadioShack #276-1499

Capacitor, electrolytic, 1μF–33μF such

as RadioShack #272-1026. Mine came

from RadioShack assortment #272-

802.

TEPSPROJECT STEPS

Form the coil.

Cut the board.

Mount the coil.

Add capacitor C3 and resistor R2.

Add the electrolytic cap, resistor R1, and capacitor C2.

Add the transistor.

Add the 10pF caps, resistor R3, and the battery clip.

Attach the phone plug.

Tune it up!

0. Mount the battery.

http://www.radioshack.com/product/index.jsp?productId=2102588http://www.radioshack.com/product/index.jsp?productId=2102495http://www.radioshack.com/product/index.jsp?productId=2062304http://www.radioshack.com/product/index.jsp?productId=2103345http://www.radioshack.com/product/index.jsp?productId=2049744http://www.radioshack.com/product/index.jsp?productId=3869996http://www.radioshack.com/product/index.jsp?productId=2062375


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ADVERTISEMENT

tep #9: Tune it up!

Attach your 9V battery to the battery clip and insert the phone plug into an audio source like an MP

player or smartphone. Start a song or other easily-recognizable audio track playing, then turn on yo

radio and scan through the FM band to locate the transmission.


6/14

TIPS:

Start with your receiver right next to the transmitter.

A digital tuner with precision down to 0.01MHz may be helpful.

Be patient and careful. Scanning is a bit tedious, but if you get impatient you may miss the sign

altogether and mistakenly believe the transmitter isn't working.

If you scan the entire band and can't locate your signal, try changing the orientation of your rece

antenna with respect to the board and scanning again.

It's best to run your audio source on battery power when you are ⸀rst isolating the transmitting

frequency. If you have to run it from mains power, make sure electrically noisy devices like

漀uorescent lights, TVs, and computer monitors are not active on the same circuit at the time.

You can tune the transmitting frequency by changing the spacing between turns in the coil. Closin

spacing will lower the transmitting frequency, while opening it up will raise the transmitting freque

You can also use a variable capacitor for tuning (see Step 7).

SEAN MICHAEL RAGANI am descended from 5,000 generations of tool-using primates

Also, I went to college and stuff. I am a long-time contributor to

MAKE magazine and makezine.com. My work has also appear

in ReadyMade , c't – Magazin für Computertechnik , and The Wa

Street Journal.

mragan.com // Etsy // shapeways // Thingiverse

55 Comments 1

Amitabh Songar a •

sir

can you tell how we can change the frequency

[email protected]

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7/14

• •

• •

WH •

you can change the frequency if you replace C5 10pF capacitor with a 2-22pF variable

capacitor.

• •

Nick Vanderplop •

or any other variable capacitor with a similar range

• •

Rizwan Qayyum •

Inductor value ??

• •

WH •

approximately 42.74 nH

http://www.66pacific.com/calcu...

http://www.daycounter.com/Calc...

i just used a coil inductance calculator on the above pages with data from thi

site

turns 4

diameter: 6.35mm (0.25 inches)

length:12mm (0.472441 inches)

• •

Boguslav •

You have one mistake. Approximately, inductance is 84,25 nH. For calculatio

you need diameter of the wire, but no length. Take link with calc:

http://cxem.net/calc/inductor_... 84.2 84.2NY

• •

Koby •

this is awesome I'm going to make one. But where would you connect the antenna?

• •

Zidane Tribal •

you would hook up the antenna to the emitter of the transistor. at least thats what the diagra

shows and how i have it hooked up. havent tested the distance yet.

caswell •

Hi, I have built the super simple radio transmitter, it works but the signal is too noisy or scratchy, wh

can I do to enhance, I suspect my coil is the problem as it is not even, it is also found too low in theFM s ectrum how can I move it u to the mix be ran e of the s ectrum thanks a lot en o ed build

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8/14

• •

it......caswell

• •

michael george •

This is an amazing circuit. it works properly :)

but it would be better if you explained the function of each component in details.

Would you tell me what the function of C4 is ?

Thanks in advance sir,

• •

Jake •

It has been very hard for me to find solid copper in my area can I use tinned copper instead?

• •

Nathanael Beall •

use a standard cable wire, (for TV installation) there usually 18 awg

• •

Zidane Tribal •

i made this myself, but it seems that with a 9v battery i can only use volume 36 at most without

significant distortion. i dont know much about transistors and their voltage ratings, but i hooked it up

using 18 volts and it was running fine and i could use a higher input voltage as well. hoever, after

about an hour the 2 9v batteries were warm - how would i check the current draw? i tried the amp

probe on my meter but it didnt work.

• •

-FireControlman 2nd Class USN •

current draw would be P/E. power divided by voltage, so you have to do the math and find t

current through the collector and go from there

• •

Anup Upadhyaya •

Where can I find the hardware used ? Can I find it inside a CD player? Or inside a Radio ?

P.S. : I am not a electronics student.

John Daniels •

You could probably find it all in a radio, but any electronics parts store should have everythi

you need. Radio Shack is the traditional place to find this stuff in the US, but these days

they're hit and miss. Amazon.com probably has it but you might have to buy large quantities

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9/14

• •

You don't have to be an electronics student if you just look at the numbers. Usually the volta

rating on these parts (for example 25v) is the maximum voltage you can apply. Since this us

a 9v battery, anything above 9v will be ok and anything lower than 9v could burn out. The

resistance or capacitance rating is the number that you need to match (for example 103k on

the resistor and 22uF on the capacitor). I hope this helps you find the right parts.

Yikes, I'm just noticing that you posted this a year ago. I hope this can still help you a little o

anyone else just starting out.

• •

Aidan Payne •

Where would I attach an antenna that has multiple connections, like on taken from an old radio?

• •

Irfanuddin Shafi •

One to capacitor c5 and the ground to ground plane.

• •

Saurabh Singh •

is any substitution of 2N3904 transistor.If exists pls reply.

• •

Gareth Andrews •

2N3904 / BC547 / PN2222 / 2N4401 are all NPN transistors,

don't know if they'll work but its worth a try :)

• •

Fokko Perton •

Bc547 or 537 both work a charm, they're more easily gettable in my case.

• •

WH •

This is fantastic. Thank you very much for posting it. It works very well. I use it in the car in order to

connect my phone to the radio so i can play whatever i want. Without antenna the range is just 1 or

meters so it doesn't cause any interference at all. When i attached an 82cm long copper wire as anantenna the range went up to 100m or so. I may connect the circuit to the 12V electrical circuit of th

car. I assume it will just increase the range.

• •

Thilina Jayasingha •

Is it works realy.i'm not make it. But i wanto know what freaquency can heard you?plz reply

me as soon as possible.

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10/14

• •

•

yes, it works but the frequency is sensitive. In prototype board i

first got 91MHz then i built the circuit on copper board and the freq

went down to 86MHz which is out of the FM range. In my experience the frequency

also depends on the battery level and whether or not an antenna (that can be an 80c

long copper wire) is connected to the output. I checked the output freq with a high fre

oscilloscope.

If you use a 2-22pF variable capacitor in place of C5 you can change the output freq

The less the capacitance the higher the output frequency but the less the outputperformance will be. You can compensate the performance drop by adding an anten

but it affects the freq a little.

• •

lim •

could you can show all details for the resistor ! Cuz i final year wan to do it

• •

concerned_legal_citizen • Sean, I just finished building the fm transmitter. I did get it to work, however, it is very sensitive

touching any of the components on the board. I added a 3 inch antenna. To get the transmitter to wo

I have to adjust the coil and then back away about 6 feet to hear it working. Is the one you built this

sensitive to frequency changes and proximity to your body?

• •

Toad of Toad Hall •

Very interesting. Quite illegal, of course.

But, oh dear, didn't they teach you to look after your tools?

• •

Dhave Gatchalian •

can i use bc548 transistor?

• •

Cubeofcheese •

I have 18 guage wire, but out is not solid, would it still work?

• •

Lukas •

Amazing, am i the first to realise that it works just fine without any power/battery...

This meant i could make a tiny adapter for my phone to play music to any radio!

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11/14

• •

Gaurav •

Hey Lukas that was indeed remarkable.Would be great if you could please share this comp

PCB component layout with us...

• •

Lukas •

Sorry I didn't notice the comments.. To be honest, All i did was place all the

components in a line as you can see in the picture. But I made sure that the

components next to each other made connections in order to avoid too many jumpe

cables. I used a project board rather than a custom pcb. I just have to point out that t

audio input provides enough power to emit a weak signal which i found can only be

captured by more powerfull radios with a very low range of about 1m. However, this

pretty remarkable considering it does NOT REQUIRE a battery too work! Unfortuna

i don't remember and i dont have time to create the layout which i used to build the

transmitter in the picture but give it a try! Play around with the layout.

• •

Gaurav •

Hi Lukas...thanks for taking time to reply.Can you please support by atleast

clicking a TOP and Back Image of your assembly for my kind reference.

Also I am surprised when you say that this circuit doesn't require any power

it works on a 9V battery !!!

Thanks,

GauravIndia

• •

Gabriele •

You can send me the schematic and components that you used? I I want a test for my phon

• •

JS7457 •

i make it and it so cool !! do it with a cooper board ! Very good quality for me !102,5 Mhz ! I use a 0.05mm solid cooper wire, 4 turns !

• •

raiden •

can u plzzz tell me the priciple on which it works....plzzz explian the working of the model ......it is fo

my physics project ........plzz reply fast

Finnley •

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davidson •

can we see yours?

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Noah Stewart •

Has anyone created a stereo version of this?

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Shrivardhan Kantharia •

yes i have but it's not working

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FIREphaenix •

Is it possible to make it any smaller?

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Gareth Andrews •

size? yes. components? not really.

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FIREphaenix •

shame

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vishwanath k •

Sir ,

Instead of copper clad board i have used normal PCB i am not getting output in my circuit also i hav

used C1 as 0.01uf has variable capacitor is not available in my region .PLEASE TELL ME HOW TO

GET OUTPUT ...

thank you.

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13/14

Load more comments

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Eden Simpson •

Hi I recently made one of these, for C1 i used 1uf. the input doesn't need to be very loud for

to work. For lack of copper board i used the 3D approach as seen in the picture.

I used a BC547 as the transistor.

My one is 96.1 mhz but it only works if you hold the Antenna.?

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Nathanael Beall •

it is using your as a big antenna

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avier • may be u have a bridge somewere, probably on ground, o you have not at all so you

are instead when u touch it.

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Advait •

I dont understand?

how will that happen?

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Indira Ganesan •

does the receiver detect the new frequency we r broadcastig or it chooses the previously available

radio station frequecy

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Chetan Chauhan •

Hey, I actually made this fm transmitter for my school project but the problem with the transmitter is

that it is emitting the input at every frequency so there is no particular frequency required and there

lot of noise while receiving the signal, so can anyone tell me how to solve the problem of frequency

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super simple ipod fm transmitter _ make

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