IR Remote-Control Checker

Suitable for any Infra-red emitting device

3V battery supply

Circuit diagram:

IR Remote-Control Checker


R1_____________470K  1/4W Resistor
R2______________47R  1/4W Resistor

D1______________LED  (Any dimension, shape and color)

Q1____________Infra-red Photo Transistor (Any cheap type)
Q2____________BC327   45V 800mA PNP Transistor

SW1____________SPST  Toggle or Slide Switch (Optional, see Note)

B1_______________3V Battery (2 x 1.5V AA, AAA or smaller type Cells in series)


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 pushbuttons 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.