Amplifier Timer Circuit


Posted on Feb 5, 2014

This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared by IC2A & IC2B and monitored by LED D4. When D4 illuminates, albeit for a very short peak, IC3 is reset and restarts its counting..


Amplifier Timer Circuit
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Audio peak Indicator
    Networking Security System (ATmega16L)
    VU meter circuit
    Low-Battery Indicator
    dsp sstc
    The EC10 communications receiver
    Remote-controlled preamplifier
    Energy-saving lamp circuit



    Top