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Relay from LED signal

Discussion in 'General Electronics' started by David Yates, Feb 29, 2004.

  1. David Yates

    David Yates Guest

    I'm wanting to operate a 12 V relay from the signal going to a LED. Can
    anyone point me in the right direction of a circuit please?
    Thanks
    Dave
     
  2. Pick up a copy of "The Art of Electronics" and check out the MOSFET
    circuits. You can drive the gate of a p-channel MOSFET from the anode
    of the LED without loading the LED drive circuit. The MOSFET can
    energize the relay. Make sure you protect the MOSFET by paralleling
    the relay coil with a reverse biased diode.
     
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