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This is an infrared remote control tester circuit which gives both an
audio and visual indication that a remote controller is functioning. D1
is a reverse biased photodiode which forms an IR detector.
It’s output is buffered by IC1a and then enters a pulse stretcher comprising C2, R2 and IC1b.
The pulse stretcher enables even the shortest of pulse trains to trigger
the following oscilator. D3 is a low current red LED which provides
the visual indication when the infrared remote is directed to the tester
Those Images in folder YOURTHEME/img/patterns/