This circuit allows us to connect a 128x64 display with the PC parallel port.
This circuit is used for switching a computer or any other device which start operating by a click, after a blackout (when power is restored).
This circuit is based on the infrared receiver IS471F. The running principle of the circuit is easy.The transmitter is an infrared LED that emits a modulated signal monitored by the 4-pin of the IS471F.
This is a simple and a very useful circuit to slow down the PC fans and remove the noise.