Simple Squarewave FM receiver?

Discussion in 'The Projects Forum' started by ayashifx55, Mar 23, 2011.

  1. ayashifx55

    Thread Starter New Member

    Dec 17, 2010
    21
    0
    Hi everyone,

    I am currently working on a FM square wave receiver. Basically it demodulates my signal and outputs the frequency i need (square wave 1khz 1vpp)

    I tried using PLL receiver but it does not demodulate square. I am out of choices.

    Can anyone suggest a name for a simple square wave receiver (if possible?)

    The reason why is i have a LM555 which creates PWM , then it is amplified by a 2 stage amplifier , it transmits through collpitt oscillator.

    This PWM will control a servo and it works extremely well but i need a receive to demodulate square wave.....really need your help everyone !!

    Thanks.
     
    Last edited: Mar 23, 2011
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    A simple monostable will FM demodulate a FM signal. Just put a low pass filter after the monostable and the audio will be what's left.
     
  3. ayashifx55

    Thread Starter New Member

    Dec 17, 2010
    21
    0
    Do you mean a typical monostable circuit using LM555 and the LP filter it?

    Can you suggest me a circuit or i can simply google a monostable circuit , then antenna to input of the monostable circuit, to LP filter, to PLL receiver?


    THANK YOU VERY MUCH !!!!
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    The monostable replaces the PPL. It works by a different principle, but the end result is the same. It turns an FM signal is a form of PWM (pulse width modulation).
     
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