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Question: Simple FM reciever????

Discussion in 'General Electronics Discussion' started by samy555, Oct 15, 2012.

  1. samy555

    samy555

    63
    0
    May 11, 2010
    The following is FM radio reciever circuit from:
    http://www.hqew.net/circuit-diagram/Small-FM-Radio-Circuit_8896.html

    [​IMG]

    I do not intend to implement, but Surprised by the way the two transistors T1&T2 connected.
    The tuned recieved FM signal inter the collector of T2 and out of its base to feed to the audio amplifier
    It is the first time in my life watching that stage audio feed from the base of the transistor
    Can you help me understand the work of those two transistors?
    Thank you very much
     
  2. duke37

    duke37

    5,231
    718
    Jan 9, 2011
    I have not seen this circuit either. It looks to me to be an oscillator, running at the FM frequency which is modulated by the incoming signal.
    Super regenerative receivers are used in car locks. This may be one of those.
     
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