1.5 Watt FM Transmitter

This is a simple, well designed 1.5 Watt FM Transmitter circuit using power transistor 2N2219A. This circuit should be able to cover 1-2 KM range. It use +5-30V power supply to work.

1.5 Watt FM Transmitter circuit diagram

Refer to the above diagram, the input source is an electret condenser microphone (you may try to? use other input sources) and signal gain from the input can be adjusted by using the potentiometer P1. You can easily prepare the PCB by using any PCB editor and apply it to the board by using the ironing method. The coils and the antenna can be designed as a part of the PCB made up of the copper area.

Components List:

R1=220K
R2=4.7K
R3,R4=10K
R5=100ohm
C1,C2=4.7uF Electrolytic
C3,C4=1nF
C5=2-15pF
C6=3.3pF
Q1=BC547C
Q2=2N2219A
P1=25K
MIC=Electret Condenser Type

P1 act as condenser microphone volume level. For FM, coil will be small. Use thin gauge enamel magnet wire. the diameter of coil will be a couple mm: use ink tube from pen to form, and try 8-12 turns. Small inductance coils make for much guess work.

Good luck.

40 comments

  1. HELLO FRIENDS,
    I MAID THIS PROJECT SUCCESSFULLY. WITH PROPER FREQUENCY AND STRENGTH.IF YOU WANT HELP THEN CONTACT ME ON kpkpkalpesh@gmail.com or at 08866792042?? i will surly help you to bring out you from the problem 🙂

  2. A.M.MAHVY,MUMBAI plz can you help me to make this fm transmitter i from surat, gujarat. plz can you give me you e-mail add…… ?

  3. i want to know how i joint the P1,Q1,Q2. and what is the use of P1. i have made this circuit but its range is very poor. what can i do for this condition. please tell me.

  4. WE CAN CONNECT 3.5 MM CONNECTOR AFTER PUTTING TWO1MEG RESISTORS INSTED OF MIKE & PLAY MUSIC FROM MOBILE.IT TRANSMITS VERY GOOD SOUNDS.

  5. can anyone please tell me what is the frequency in which the FM transmits for this circuit????
    thanx in advance

  6. 22 SWG. 8 TURNS,3MM DIA. CLOSE WOND, C 6 4.7 PF, AT LEAST 1 MTR. TELESCOPIC ANT.TO COMPLETE COLPITTS OCELIATOR.

  7. I am working on this project of a 1.5W FM transmitter circuit. Please tell me the diameter of the inductance coils that i can use in this project. Am looking forward to receiving your response.

  8. I JUST ADDED .01CON.IN PARALAL,TELESCOPIC ANT.AND 9 V BAT. TO MAKE PORTABLE.

  9. I HAVE ASSAMBLED IT,EASILY FOR MY SON PERFECTLY WORKING,I PUT IN SMALL BOX.ALL COST ME RS.130/ONLY.

  10. if you know somewhere I can get a receiver diagram for this transmitter Please let me know @ erandahasithapriya@gmail.com

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