Help with Infrared Transmit Circuit using IC 555

Discussion in 'The Projects Forum' started by dknovo, Dec 22, 2014.

  1. dknovo

    Thread Starter New Member

    Sep 8, 2014
    Hello everyone, I am designing an infrared transmitted circuit using ic 555 and i wonder that
    IC 555 will transmit an interrupted pulse to the Received circuit ( I mean the IC blinks leds )
    so, what is different between using IC 555 in the circuit and without using IC555 in the circuit.
    Why don't we transmit Infrared light directly to the Received circuit without using IC555 ?
  2. ericgibbs

    Senior Member

    Jan 29, 2010
    By switching the IR emitter On/Off with a 555, the IR beam is effectively AC, so the receiver can be AC coupled and any ambient light will not be amplified by the receiver amp.