Push pull amplifier enabler

Discussion in 'General Electronics Chat' started by mytch, May 28, 2014.

  1. mytch

    Thread Starter New Member

    May 28, 2014
    1
    0
    Hello all,

    I am trying to come up with a circuit to enable an amplifier for a push pull circuit, but I wanted to have the enabler on if the wave from is switching every <50us (20kHz+) I was trying to use a missing pulse detector like below, but Im kind of stuck any suggestions?
     
  2. Brownout

    Well-Known Member

    Jan 10, 2012
    2,375
    998
    Where are you stuck? What do you mean by a "waveform that is switching?" Are you looking for a low (0V) level?
     
  3. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,546
    1,252
    My guess:

    You have an amplifier connected to a signal source, and you want the amplifier to be off if the signal is absent, and come on automatically when the signal appears. The signal has a minimum frequency of 20 KHz. To do this, you want to build a missing pulse detector to generate an enable/disable signal.

    Yes?

    ak
     
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