Would this FM transmitter work?

Discussion in 'The Projects Forum' started by Pleasedonthitme, Aug 29, 2013.

  1. Pleasedonthitme

    Thread Starter New Member

    Aug 29, 2013
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  2. cornishlad

    Member

    Jul 31, 2013
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    Quite possibly...but with only one low q tuned circuit in the whole thing it's likely to transmit spurious signal all over the place, inclusing some AM I expect.
     
  3. sheldons

    Well-Known Member

    Oct 26, 2011
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    wont be as good as my transmitter ive made to boost my home wi fi.....

    [​IMG]
     
    spark8217, absf and #12 like this.
  4. Shagas

    Active Member

    May 13, 2013
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    Looks pretty cool , sheldons . Does it work?
     
  5. #12

    Expert

    Nov 30, 2010
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    Yes. I found a program that calculates a parabolic director made of aluminum foil and cardboard. A peanut can is similar.:D
     
  6. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    I have not confirmed their calculations but saw a proof once that a Pringles can provides optimal coupling.

    [​IMG]
     
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  7. wayneh

    Expert

    Sep 9, 2010
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    Calculations, proofs, programs.

    How about an answer to Shagas' question? :confused:
     
  8. Sensacell

    Well-Known Member

    Jun 19, 2012
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    It will probably work, but it's going to be annoyingly unstable, i.e. moving a hand near the antenna will shift the frequency, as well as any variation in the supply voltage.
     
  9. cornishlad

    Member

    Jul 31, 2013
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    Right answer to the wrong question ! LOL Glad I'm not the only one who does that sort of thing .
     
  10. Sensacell

    Well-Known Member

    Jun 19, 2012
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    I am answering the OP's question with an on-point relevant answer, your comment puzzles me?
     
  11. DickCappels

    Moderator

    Aug 21, 2008
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    Yes, that is probably the world's oldest and best-proven DIY FM transmistter (I first saw it in a 1966 Popular Electronics Magazine and have made many since. It is very forgiving circuit and has never disappointed. Yes, hand capacitance can cause frequency shift.

    If you use this variation, you can largely escape the frequency shift problem.
    http://cappels.org/dproj/FMVFO/fmvfo.htm
     
  12. cornishlad

    Member

    Jul 31, 2013
    196
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    Ok..It was ME that got confused :confused: Shagras's question was "does it work" If I had read more carefully I would have seen that it as in fact directed to ErnieM. Your response was spot on and I saw it was an answer to the OPs question. humble grovelling. lesson learned, I MUST read Very carefully...
     
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