Instructables
Picture of Make a 1.5v Single-Transistor FM Transmitter
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Hello!

I'm gonna show you How to make a Simple FM Transmitter that works with only an AA battery.

Components:
47 pF Ceramic Capacitor x1
33 pF Ceramic Capacitor x1
10 pF Ceramic Capacitor x1
22 uF Electrolytic Capacitor x1
2SC655 (or BC548) Transistor x1
Single Battery Holder (AA Size)
small Breadboard/PCB
10cm Magnet wire x2
Audio Signal Source (e.g. a MP3 Player)

Tools:
Soldering Iron
Solder
 
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Step 1: The Circuit and Parts

Picture of The Circuit and Parts
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Here is the Circuit we're going to make.

Step 2: Start Soldering Parts on PCB

Picture of Start Soldering Parts on PCB
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It takes about 10-12 mins to do this.

Step 3: Make the Coils

Picture of Make the Coils
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Wrap the first Magnet Wire around a thick pen or a size AAA battery.

Do the same for the second Magnet Wire, too.

...Then Solder them on PCB

Step 4: Final Steps

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Solder the battery holder wires, Antenna Wire, and the Audio Source.

Step 5: Turn on your Radio

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Turn on a radio and set it at 89MHz FM
Connect the "Audio In" of the Transmitter to your MP3 Player (or any other non-amplified things playing music).
Place the Battery in the holder.

Enjoy!
WalterW1 made it!3 months ago

I have made this and it didn't work at all, I put it on 89Mhz all around it, went through the whole spectra of frequencies, nothing worked! Don't waste your time on this people, if even his picture instructions were in focus, piece of advice get a better camera and make instructions that actually work, I'm really pissed off now

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WalterW1 made it!3 months ago

I have made this and it didn't work at all, I put it on 89Mhz all around it, went through the whole spectra of frequencies, nothing worked! Don't waste your time on this people, if even his picture instructions were in focus, piece of advice get a better camera and make instructions that actually work, I'm really pissed off now

photo 1.JPGphoto 2.JPG
khalidco20107 months ago

May Allah reward you well

cool thanxxxxxx

Adarsh_tronix9 months ago

How can I change the frequency of the emitter?I guess it depends on one of those capacitors..but which one?

It is NOT the capacitors (however, the Farads matter) the frequency is changed based upon the oscillation of the inductors (the coils of wire) if you want to change the frequency, search the internet for a calculator that to find how many turns of wire you'll need for a specific frequency.

dmarcelo211 months ago
qual e o concumo??
imaduddin1 year ago
how the magnetic wire diameter?
avashisht11 year ago
how is the sound quality???
lseemann1 year ago
nice gag, is it a stereo transmitter or only mono?
vicenzio201 year ago
but the receiver as lai made?
parmar_cd1 year ago
There is a problem in this circuit, every time frequency is change when you move the circuit. Can i put variable/trimmer capacitor in this circuit. If yes where to put the variable capacitor and which type of capacitor. Thanks
how to increase the range of transmitter.
jumper11112 years ago
What's the range of this transmitter
~CableGuy (author)  jumper11112 years ago
About 10 meters max!!!
tutdude982 years ago
Where did you get pcb
~CableGuy (author)  tutdude982 years ago
My uncle is owner of an electronic components selling website. I gave him the circuit and asked for a PCB.
I Had salvaged the components before from an old cordless phone.
Would a nte199 work for the transistor?