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fm transmitter problem

Discussion in 'General Electronics' started by dhtp, Jul 9, 2003.

  1. dhtp

    dhtp Guest

    Hi,
    I am trying to do this design, and i am quite a newbie.
    I have everything hooked except the variable capacitor, my variable
    capacitor has three legs and I don't know which ones to use, I tried a
    combination, but nothing worked. Also, does it matter if i used a coil
    from an old AM radio?
    As you see, I am just a newbie, please help me though.


    Schematic: http://www.uoguelph.ca/~antoon/circ/fmt1.htm

    Thanks in advance,

    Zaid T.
     
  2. Rich Grise

    Rich Grise Guest

    Yes, it makes a difference which coil you use. The coil and
    cap determine the operating frequency, so make a coil like
    the instructions say. About the cap, I'd have to see it,
    but if you understand that a cap is just two metal plates,
    you could probably figure out which two leads to hook
    up by inspection. Probably two of the leads are one plate,
    and the other is the other plate. If you've hooked it up
    in all possible ways, you might have blown the transistor
    because that would be a short.

    Wish I could be more help - there are lots of books, and
    sometimes a google search will turn up tutorials and
    stuff, and fairly often someone posts a link to a beginners'
    electronics site of some kind.

    Good Luck!
    Rich
     
  3. dhtp

    dhtp Guest

    Thank you very much Rich,
    I am guessing that the only reason i am not getting anything out of it
    is because the coil is too much, I will try to make one according to
    the instructions and see if that helps.

    Again, thank you very much.

    Zaid T.
     
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