Introduction: Make a 1.5v Single-Transistor FM Transmitter

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

Step 1: The Circuit and Parts

Here is the Circuit we're going to make.

Step 2: Start Soldering Parts on PCB

It takes about 10-12 mins to do this.

Step 3: Make the Coils

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

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

Step 5: Turn on Your Radio

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!

Comments

author
ggarcía-2 made it! (author)2016-08-03

And how many turns are needed?

author
ggarcía-2 made it! (author)2016-08-03

hi cable Guy!!.

What wire gauge are you using?, I went to the electronics shop and I found that I several gauges :D

I bought on that its not thinner but not so fat.

author
Adarsh_tronix made it! (author)2014-03-17

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

author
cheezyguy5 made it! (author)cheezyguy52014-04-08

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.

author
Adarsh_tronix made it! (author)Adarsh_tronix2015-03-22

Thank you very much!

author
KolesB made it! (author)2015-02-21

how conect mp3 player its not work

author
anuragtheviper made it! (author)anuragtheviper2015-03-03

try replacing the Audio In wire with a MONO 3.5mm Jack

author
WalterW1 made it! (author)2014-09-14

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
author
WalterW1 made it! (author)2014-09-14

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
author
khalidco2010 made it! (author)2014-04-26

May Allah reward you well

cool thanxxxxxx

author
dmarcelo2 made it! (author)2013-12-29

qual e o concumo??

author
imaduddin made it! (author)2013-10-02

how the magnetic wire diameter?

author
avashisht1 made it! (author)2013-06-08

how is the sound quality???

author
lseemann made it! (author)2013-06-05

nice gag, is it a stereo transmitter or only mono?

author
vicenzio20 made it! (author)2013-04-27

but the receiver as lai made?

author
parmar_cd made it! (author)2013-02-20

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

author
rajaniket00 made it! (author)2012-12-22

how to increase the range of transmitter.

author
jumper1111 made it! (author)2012-10-17

What's the range of this transmitter

author
~CableGuy made it! (author)~CableGuy2012-10-20

About 10 meters max!!!

author
tutdude98 made it! (author)2012-08-09

Where did you get pcb

author
~CableGuy made it! (author)~CableGuy2012-08-09

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.

author
Computothought made it! (author)2012-08-08

Would a nte199 work for the transistor?

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