IR noise reduction

Discussion in 'The Projects Forum' started by Msinks, Mar 20, 2012.

  1. Msinks

    Thread Starter Member

    Mar 3, 2012
    I successfully built an IR remote control extender circuit (for Image follow this link: The only problem is the noise. I temporary replaced D1 with an LED to show if the circuit was receiving the signal from a remote control and it flashed at the press of a button on the remote to show that it was, at 3 volts. But at 5V which the circuit requires the LED stays on for good. It does not go off! could this be an indication of noise. If so how can i reduce it? (The only difference I made was to use NE 555 for the timer)

    Last edited by a moderator: Mar 20, 2012
  2. jimkeith

    Well-Known Member

    Oct 26, 2011
    Measure the voltage at pin 5 as you vary Vcc--that may provide a clue
    Possibly ambient light is messing with the sensor--try covering it to see what happens
  3. Msinks

    Thread Starter Member

    Mar 3, 2012
    Thanks very much!
  4. DickCappels


    Aug 21, 2008
    I would bet on the optical solution, but you can also try placing a bypass capacitor across pins 1 and 8.