1.5 Watt FM Transmitter

By | May 14, 2009

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

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.

1.5 Watt FM Transmitter circuit
1.5 Watt FM Transmitter was last modified: July 30th, 2014 by circuit diagram

Scheme related to 1.5 Watt FM Transmitter:

40 thoughts on “1.5 Watt FM Transmitter

  1. Emmanuel

    Hi emmanuel pls i need 1000w fm transmitter circuit diagram and power amplifier for school assingments. Thinks from emmanuel

  2. dave scotland uk

    this is nothing more than a power oscillator running or using this type of design for anything more than testing within the home is very unwise. the circuit does cause very bad harmonics witch causes RFI on the upper and lower bands. i.e transmitting@100mhz causes RFI @200mhz ,300mhz, 400mhz and carries on the same on the lower bands as well.. aslo with this type of circuit the final transistor(2219) gets too hot causeing the transmission freq to drift -/+ 2-3mhz. i have many designs i have made and still use today. if any one would like a diagram. just let me know mail me dee_stew77@yahoo.co.uk

  3. ogene vincent

    i was given a project topic to build am fm reciever 100w.my problem is i dont know were to start,wat i need and the components needed to build it.plz cam u help me

  4. UKAIRO MICHAEL KALU

    please I’ll be happy if you can send me this circuit diagram with the polarities of the capacitors. please Ineed this for my school projects
    (+234)8063409127

  5. Dave scotland uk

    Thanks for all emails for diagrams i am now selling transmitter and transmitter kits 1.0watt to 50watt Please email me if you with to buy thanks

  6. Adit lessai

    Are there more than 75W tx FM circuits? I need it.

  7. manpreet

    in this ckt carrier is not available…..then how we modulate signal

  8. Sanusey

    i am looking for the components of an fm transmitter the materials needed to set up one or circuit diagrams how to build one i am making is for my assignment and also to widen my knowledge in electronics. thanks to anyone who will email me a shakorbantang@yahoo.co.uk

  9. koffi

    i need a radio receiver circuit diagram with built-in amplifier that is 3-9volts

  10. Arif_BPI_Bangladesh

    I want +ve _ve of c1,c2 and how do i make this coil ?

  11. kadam balasaheb sadashive at.naraled

    thnak you for this circuit

  12. stupido

    can i just buy that coil? im having problem in making it :) PLEASE HELP

  13. Madhav Humagain

    Sorry but We cant get 2219 here. Which next may replace it?

  14. paul

    pls i need a transmitter and step by on how to develop an atm by pass

  15. A.M.MAHVY,MUMBAI.

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

  16. A.M.MAHVY,MUMBAI.

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

  17. Kellen Katumusiime

    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.

  18. kehkashan

    how this circuit works..explain its working

  19. A.M.MAHVY,MUMBAI.

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

  20. vivek

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

  21. A.M.MAHVY,MUMBAI.

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

  22. neeraj

    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.

  23. neeraj

    sir i could not find the C6-3.3pf.which capacitor i can use at the place of C6.

  24. nick

    hey, how to calculat frequancy of circuit. Please give me equation of calculation

  25. KALPESH CHHABHAIYA

    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…… ?

  26. KALPESH CHHABHAIYA

    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 :)

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