Infrared Remote Tester

Description 

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: 

Parts:

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

Notes: 

• 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 

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