fm transmission circuit with materials list
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200 Meter Transmitter
– This one is yet another simple FM transmitter but more stable than the onelisted above. The basic functioning of the circuit is same as the above one, two stages served by twotransistors – first stage as preamplifier and second stage as oscillator and modulator. Many of thereaders has posted comments in this circuit asking how to calculate frequency of the output wave andhow to make inductor for the tank circuit. Both questions are answered in comments section by
Seetharaman
and
John
IC based FM Transmitter
– Instead of two transistor stage transmitter as we saw above, here weuse an IC – UPC1651 (wide band UHF MMIC amplifier). The use of IC makes possible easy wiringand assembling of the circuit. You only need to worry about giving input and the tank circuit forcreating oscillations.
Stereo FM Transmitter using BA1404 IC
- This is a stereo FM transmitter circuit using an IC fromRohmm semiconductors named BA1404 – which is a monolithic IC and has built in stereomodulator, FM modulator, RF amplifier circuitries.This FM modulator can be operated between 76to 108Mhz.
Stereo FM Transmitter using PLL
– This is one of the high quality FM transmitters available inthis list and obviously it comes with a complex circuitry. This circuit is made using IC BH1417(which is a PLL stereo transmitter IC from Rohm semiconductors). The IC has separate audio processing sections for the left and right channels, pre emphasis circuit for improving signal to noiseratio, crystal control circuitry for accurate frequency locking, multiplex circuit for making sum etc.Starting from 88.7Mhz, there are 14 possible transmission frequencies incrementing in steps of
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It is one of the easiest, simplest and the cheapest FM transmitter kit. You can buy it on buildcircuit.com.au
RECOMMENDATION: If you thinking of building your own FM Transmitter, please try this one:
http://www.buildcircuit.com.au/fm-transmitter-diy-learning-kit
Description:
After getting several comments from young electronic students , I am rewriting this article to make the FM transmitter making process more clear.
This tutorial is for making simplest FM transmitter using one transistor. You can make this project with less components and it is an easy and simple project for beginners.
Before you proceed, please see the schematic given below. In the schematic, you will see the components required for making an FM transmitter.The transmission range of this circuit is approximately 10-20 meters.
The schematic of FM transmitter is given below:

You need the following components for this experiment:
1. Q1- Transistor- 2N3904

2. Capacitors- 4.7pF, 20pF, 0.001uF, 22nF.
Note: 0.001uF has code 102 and 22nF has code 223.
3. Variable capacitor: VC1. It is also called trimmer capacitor. You can buy one from your local store. The capacitance range should be 0-100pF or 10-100pF. If you cannot get one, try to get a trimmer capacitor that has minimum capacitance of 20pF. You can also get such capacitor from your broken radio, but you may need assistance in getting that out from your radio.

4. Resistors- 4.7 kilo Ohm, 470 Ohm
5. Condensor/ Electret Microphone

On your electret microphone, you will see that on one of the pins, there is solder pad connected to the case of microphone. Remember that pin is always negative.

6. Inductor- 0.1uF.
6-7 turns using 26 SWG wire.
You need to scrap the ends of inductor, otherwise, the inductor won’t work. Check the video given below to know how to make an inductor.

Or you can also use another inductor.
0.1uH
Learn to make an inductor for FM transmitter
7. Antenna: Use 15cm to 1 meter long wire for antenna. If you have a long antenna, the signal transmission will be better.
The following picture shows the components used for making FM transmitter. You can simply follow the steps shown below.
On the image shown below, you can notice that I have not used a trimmer/variable capacitor. I have used a fixed 20pF capacitor instead. So, if you don’t have a variable capacitor, you can use a fixed capacitor also.


Insert transistor, resistors and capacitors on breadboard. You can see the values of the components on the previous picture.

Then insert electret microphone.

NOTE: terminal touching the casing is -ve


Use 15cm long antenna. You can use a normal wire for antenna.






Then, with a non-conductive tool, adjust the capacitor for the clearest reception, rotate it till the receiver receives a sound from the microphone of transmitter. Use the following formula for determining the frequency.
Set your FM receiver for a clear, blank station.

Best of luck
RECOMMENDATION: If you thinking of building your own FM Transmitter, please try this one:
http://www.buildcircuit.com.au/fm-transmitter-diy-learning-kit
Description:
After getting several comments from young electronic students , I am rewriting this article to make the FM transmitter making process more clear.
This tutorial is for making simplest FM transmitter using one transistor. You can make this project with less components and it is an easy and simple project for beginners.
Before you proceed, please see the schematic given below. In the schematic, you will see the components required for making an FM transmitter.The transmission range of this circuit is approximately 10-20 meters.
The schematic of FM transmitter is given below:

You need the following components for this experiment:
1. Q1- Transistor- 2N3904

2. Capacitors- 4.7pF, 20pF, 0.001uF, 22nF.
Note: 0.001uF has code 102 and 22nF has code 223.
3. Variable capacitor: VC1. It is also called trimmer capacitor. You can buy one from your local store. The capacitance range should be 0-100pF or 10-100pF. If you cannot get one, try to get a trimmer capacitor that has minimum capacitance of 20pF. You can also get such capacitor from your broken radio, but you may need assistance in getting that out from your radio.

4. Resistors- 4.7 kilo Ohm, 470 Ohm
5. Condensor/ Electret Microphone

On your electret microphone, you will see that on one of the pins, there is solder pad connected to the case of microphone. Remember that pin is always negative.

6. Inductor- 0.1uF.
6-7 turns using 26 SWG wire.
You need to scrap the ends of inductor, otherwise, the inductor won’t work. Check the video given below to know how to make an inductor.

Or you can also use another inductor.
0.1uH
Learn to make an inductor for FM transmitter
7. Antenna: Use 15cm to 1 meter long wire for antenna. If you have a long antenna, the signal transmission will be better.
The following picture shows the components used for making FM transmitter. You can simply follow the steps shown below.
On the image shown below, you can notice that I have not used a trimmer/variable capacitor. I have used a fixed 20pF capacitor instead. So, if you don’t have a variable capacitor, you can use a fixed capacitor also.


Insert transistor, resistors and capacitors on breadboard. You can see the values of the components on the previous picture.

Then insert electret microphone.

NOTE: terminal touching the casing is -ve


Use 15cm long antenna. You can use a normal wire for antenna.






Then, with a non-conductive tool, adjust the capacitor for the clearest reception, rotate it till the receiver receives a sound from the microphone of transmitter. Use the following formula for determining the frequency.
Set your FM receiver for a clear, blank station.

Best of luck
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