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Weiss FM demodulator

Discussion in 'Radio and Wireless' started by aurelZ, Jul 12, 2019.

  1. aurelZ

    aurelZ

    64
    7
    Jun 10, 2019
    Hi
    Is there more information about Weiss FM demodulator?
    thanks!
     
  2. Martaine2005

    Martaine2005

    2,436
    648
    May 12, 2015
    You could try here.

    Martin
     
  3. aurelZ

    aurelZ

    64
    7
    Jun 10, 2019
    On the given link there is nothing about this type of demodulator or detector.
    It is strange that there is so small amount of information about this.
     
  4. Martaine2005

    Martaine2005

    2,436
    648
    May 12, 2015
    Yes, that's true.
    I know what FM modulation/demodulation is but what is Weiss?
    What are you trying to achieve?

    Anything to do with metal detectors? as in discrimination or detection?
    I am just curious.

    EDIT: I just read this in Wiki....
    Other FM detectors
    Less common, specialized, or obsolescent types of detectors include:[8]

    • Travis[9] or double tuned circuit discriminator using two non-interacting tuned circuits above and below the nominal center frequency
    • Weiss discriminator which uses a single LC tuned circuit or crystal
    • Pulse count discriminator which converts the frequency to a train of constant amplitude pulses, producing a voltage directly proportional to the frequency
    Martin
     
    Last edited: Jul 17, 2019
  5. aurelZ

    aurelZ

    64
    7
    Jun 10, 2019
    Hi Martine
    Yes this one ..
    all what i have is this one i found on net. Weiss_FM_Demodulator_F9JR.gif
     
  6. aurelZ

    aurelZ

    64
    7
    Jun 10, 2019
    And i already build one with npn transistor C383 -vhf type WeissDetector.gif
     
  7. Martaine2005

    Martaine2005

    2,436
    648
    May 12, 2015
    Ah ok. That circuit is on a Spanish website 'Radioaficion'.
    Why not use their 'Mini chat' service y hablar.
    There are thousands of circuits online that do not work. Might be why there is no info on this particular circuit.

    Martin
     
  8. aurelZ

    aurelZ

    64
    7
    Jun 10, 2019
    mini chat ?????
    i don't speak spanish
    so i think that is usefull
     
  9. Martaine2005

    Martaine2005

    2,436
    648
    May 12, 2015
    Google Translate?
    Just trying to be helpful.

    Martin
     
  10. aurelZ

    aurelZ

    64
    7
    Jun 10, 2019
    Heh i see
    but that is not enough
    In most cases specific problem
    require:
    knowledge about thematic
    experience in thematic
    so nothing wrong!
     
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