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    Here are some DIY FM Transmitter circuits that we have been published on electroschematics.com. This do-it-yourself fm transmitters are pretty easy to build and will give you a good feeling when you’ll hear the music on the radio receiver.
    Don’t forget to write your comments and post some links if you know good designs that are not in the best of list.

    Best of Do-it-yourself FM Transmitters

    1W FM Transmitter with 4 transistors

    This FM transmitter circuit uses four radio frequency stages: a VHF oscillator built around transistor BF494 (T1), a preamplifier built around transistor BF200 (T2), a driver built around transistor 2N2219 (T3) and a power amplifier built around transistor 2N3866 (T4).

    1 watt four stage fm transmitter

    FM transmitter with MAX2606

    Maxim now has available a series of five integrated oscillator building blocks in the MAX260x series which cover the frequency range between 45 and 650 MHz. The MAX2606 covers the VHF band, although the frequency can only be varied by approximately ±3 MHz around the midrange frequency set by the coil L.

    SMD FM Transmitter

    Let’s construct a low-power FM transmitter using surface-mount devices (SMD) that will be received with a standard FM radio. Soldering surface mounted devices is not so hard and actually is quite easy. The figure below shows the schematic of the transmitter which consists of two stages: an oscillator and an output amplifier. Modulation is from an electret microphone but you can use a low power audio source.

    smd fm transmitter

    FM Bug Transmitter

    Take a look at this fm spy transmitter which can be used as a bug transmitter or as fm bug too. It uses a single IC 74F13, one coil, a capacitor, one trimmer, one resistor and ofcourse one electret mic. This spy bug is so easy to build and can give you a total coverage range of about 3 to 5 meters. You may want to use a small 100mW amplifier to give a little extend transmission range so you can spy from other location.

    74f13 fm bug spy transmitter

    USB FM Transmitter

    A simple USB FM transmitter that could be used to play audio files from an MP3 player or computer on a standard VHF FM radio by connecting it to an USB port. The circuit use no coils that have to be wound. This USB transmitter can be used to listen to your own music throughout your home.

    usb fm transmitter circuit diagram

    Long range FM transmitter

    This is very stable, harmonic free, long range fm transmitter circuit which can be used for fm frequencies between 88 and 108 MHz. It has a very stable oscillator because you use LM7809 stabilizer which is a 9V stabilized power supply for T1 transistor and for frequency adjustment that can be achieved by using the 10K linear potentiometer. The output power of this long range rf transmitter is around 1W but can be higher if you use transistors like KT920A, BLX65, BLY81, 2N3553, 2SC1970, 2SC1971.

    long range fm transmitter

    1 watt fm transmitter

    A very good 1 watt fm transmitter circuit, very easy to build circuit. It has 4 transistors, one is a very stable oscillator, followed by a buffer stage to prevent frequency variation when you adjust the transmitter. Next is a resonance stage and the final stage built with a minimum 1W transistor which must have a heatsink.

    1 watt fm transmitter

    Low power fm transmitter

    This low power transmitter is designed to use an input from another sound source and transmits on the commercial FM band. This low power fm radio transmitter it is actually quite powerful…

    low power fm transmitter

    BA1404 stereo FM transmitter

    BA1404 is a IC designed for fm mini stereo transmitters. It can be used as a pc fm transmitter, ipod fm transmitter, mp3 transmitter or even car fm transmitter because it has a small pcb dimension ( can fit anyplace ) and maximum 3V power supply.

    ba1404 stereo fm transmitter circuit schematic

    What do you think about this diy fm transmitters? Will you try any of it? Have you ever build one? Share your experience in the “Comments section” after this article.

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    16 Responses to "Best of FM Transmitter Circuits"

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    1. This is a great collections of FM transmitter circuits.
      Thank You,
      GuruSantiago
      Want to learn more about electronics?

      The GuruSantiago can help. Checkout his videos here:

      http://www.youtube.com/user/ElectronicsIsFun
      And follow him on twitter @ElectronicsFun

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    2. i will give it atrial

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    3. I AM MAKING A USB BLUETOOTH .PLEASE SENT MY EMAIL IT’S CIRCUIT DIAGRAM

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    4. fm radio broadcasting. i find this of great intrest.and inlightment and easy to understand.i never thought it was so intresting.thank you.i want to make a fm radio broadcasting transmiter.for commuity radio station i understand not to transmit untill iv been to ofcom and got myself a liceance.any help would be greatfull.r.w.pountney.

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      • alexpmgr8 says: on February 23, 2012 at 3:23 am

        Where to begin r.w.pountney .. Do you want to make a printed pcb ? how far do you need it to go ? let me know what your criteria is and i will get back to you with some bright ideas.

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    5. anderson says: on May 23, 2011 at 9:02 am

      wow thanks for all the circuit design. can you send some more info abt the long range FM transmitter especialy its block diagram. thank you very much

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    6. dear sir
      can you tel me that which is ft the mic in f m bug circuit
      thanks

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    7. great bug V5: http://www.sm0vpo.com/
      great transmitter pages inc. stereo and limiters for you budding broadcasters : http://www.pira.cz
      great miscilaneous pages : http://www.sm0vpo.com/ – for learners and experienced alike… :)
      transmissions are illegal check ur countries laws
      great advice : if you are thinking about becoming a pirate use a link transmitter that the radio authorities can’t intercept. U may need a couple of throw away computers and internet connections could always come in handy too :D !

      just a note, i have read all the posts. there are some of you that will need to make a UV light box’s and get the relavent bits and bobs (again see sm0vpo.com) or try and get some “pressnpeel” circuit print/b/w laser printer needed. A drill stand is also pretty use full. RF circuitry is fickle, it’s not hard if you have some idea of radio building principles tho.

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    8. biswajit biswas says: on May 19, 2012 at 10:49 am

      some body help me i want to buy two ic tsa5511 and pic16f84 but i cnt found this please help me for found this .
      email…bbanty12@gmail.com
      mo..8436552059 /

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    9. EnglishLessons_PLEASE says: on September 1, 2012 at 3:52 pm

      Ladies and gentlemen, I have been leafing through the information on this page, and I find myself accosted with terrible english. This page is rife with grammatical discord, verbal variance, and overall poor vocabulary. I appreciate the assistance those with knowledge are attempting to give those without, but I beg of you, run your posts through spellcheck before finally posting. I don’t want to complain about ‘scraping’ instead of scrapping, having an it’s and its discussion, tell people you can’t get a ‘lysanse’ for anything, to be more ‘specific’ instead of ‘pacific’, etc. Your point may be correct, but your improper use of the very language you use makes you seem a fool. Invest the time to learn a more full control of your language, you’ll notice people regarding you as far more intelligent, you will stand out.
      I appreciate you taking the time to read this post and hope I didn’t convey myself as a self-righteous jerk.

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      • English is clearly Not their First language – Get Over It ! atleast they are trying, how many languages do you speak fluently ?

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    10. Bharathi Hbk says: on September 30, 2012 at 4:15 am

      any one send me 10 km fm transmitter and above 10km fm transmitter

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    11. AOA.

      please send me range of this fm transmitter cct.

      thanks

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    12. kimbwereza says: on November 11, 2012 at 4:47 pm
        member

      pls could you send me a 1km fm transmitter cct or below 1km fm transmitter cct

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    13. sadun says: on January 24, 2013 at 4:09 pm
        member

      thanks very very much

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    14. Manipuri is not found tr 2n3553 this transister is equivalent please help me I don’t know this try equivalent

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