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Thursday, June 16, 2011

Simpliest 2 watt FM transmitter with PCB and details


 USE DIPOLE ANTENNA FOR MAXIMUM RANGE (COULD BE UP TO 10 KM IN GOOD WEATHER). TUNE BETWEEN 88-108 MHz WITH C5. BB-204 COULD BE REPLACED WITH CONVENTIONAL LED (BIG) WITH REVERSE BIAS (NO LIGHT GIVEN IN CORRECT POLARITY). 9V POWER FOR 2KM WITH GOOD SOUND QUALITY AND GRADUALLY UP TO 18V FOR 10 KM RANGE WITH POOR QUALITY OF SOUND.  BEST OF LUCK. 







www.fmradio-transmitter.blogspot.com

74 comments:

  1. how'll i make it at at home? :-o

    ReplyDelete
  2. I cant Find
    c5
    c8
    d1
    d2
    If anyone knows where to get these i would be very grateful!

    ReplyDelete
  3. thanks !but i have a question is it realy cover 10km

    ReplyDelete
  4. How to make coil for this circuit?
    I can't find the specification of coil so plz tell me specification of coil.

    ReplyDelete
    Replies
    1. The two coils are already fabricated on the PCB.

      Delete
  5. replay me fast
    im waiting reply!!!!!!!!!!!!!!!

    ReplyDelete
  6. for c5 coil 5 turns, 6 mm dia, 20swg thick

    ReplyDelete
  7. For c5 - use fm adjustable trimmer

    ReplyDelete
  8. for c5 coil 5 turns, 6 mm dia, 20swg thick

    ReplyDelete
  9. what is the coil measurements for C8 ?

    DATE: 30/04/2012

    ReplyDelete
  10. years ago i've built this exact circuit and it works quite well. i didn't have access to 2N3553 so i used BC219S (with star shaped heatsinks) and reduced supply voltage of 6V. the coil can be made using insulated wire. wire should be 0.8mm (AWG20) or thicker (thicker wire means better Q, because of skin effect), have 6 turns wound on 5mm object (I used 5.5mm drill bit as a core), then one has to to skratch insulation in the middle of the coil and solder center-tap lead. finally add 1-2 turns for secondary (for antenna) and while it's together, solder coils to PCB (all leads should be as short as possible, keep them under 5mm or so). finally object used as core is removed (air core coil). for best results one can insert small strip of sponge and drip some hot wax over it. this will help secure coil shape and reduce effects of ambient change (moisture in air etc.).

    ReplyDelete
  11. if you can't find varicap/varactor diode (D1), use any common transistor, just remove E and use BC section (you will need two of them). D1 is there just to ensure correct polarity. you can remove it or use any rectifier diode (1N4001 for example).

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  62. I make this circuit few days it work good for bb204 i use 2 led and for c8 fm trimmer ,for 2n3553 iuse 2n4427 by way you no need c6+c7=47nf it`s just filter really it`s very simple transmitter and it`s stable frequency

    ReplyDelete
    Replies
    1. don`t forget the heatsink for the transistor

      Delete
    2. hello brother i can make it. plz send component diagram shihab.nc@gmail.com

      Delete
  63. The center of the PCB, that figure which appears several square, acts like a coil?

    ReplyDelete
  64. Hi!
    I need some simple for a 20 to 30 meters but realy simple!
    Does anyone have some shema? For digital signal! 0 and 1

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    ReplyDelete
  65. I need to know the value of D2 thank you

    ReplyDelete
  66. Please which other transistors can i use as i have not seen any of the one mentioned here?

    Thanks!

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  68. Please mention the size (dimensions) of PCB so that exact size can be printed or if you can please upload the PCB file link, i shall be thank full to you

    ReplyDelete
  69. Replies
    1. D2 is just a didoe; a common one like IN4002 should work. Its purpose is to prevent the transistors getting burned when the battery polarity is reversed.

      Delete