How to build Infrared Remote Tester

September 27, 2010 - category: IR remote control


A very simple device allowing a quick check of common Infra-red Remote-Controls can be useful to the electronics amateur, frequently asked to repair or test these ubiquitous devices. A reliable circuit was designed with a handful of components: the LED will flash when any of the Remote-Control push buttons will be pressed. The side of the Remote-Control bearing the IR emitting diode(s) must be directed towards the Photo Transistor (Q1) of the checker circuit: maximum distance should not exceed about 20 - 25cm.

Circuit Diagram:

Circuit Diagram


  • R1 = 470K
  • R2 = 47R
  • D1 = LED Any Type
  • Q1 = Photo Transistor
  • Q2 = BC327
  • B1 = 3V Battery or 2 AA cell


  • Current drawing of the circuit is less than 1mA when the LED illuminates and 0mA when no signal is picked-up by the Photo Transistor: therefore, SW1 can be omitted.
  • SW1 will be SPST Toggle or Slider Switch

circuit from http://www.extremecircuits.net/2009/07/infrared-remote-tester.html

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