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IR LED will be having connecting leads same as ordinary LED.

When ever we use IR LED, which works like a transmitter

we have to connect a photo diode as a receiver (very near to IR LED).

So as we know IR LED keeps on emitting IR radiations photo diode will keeps

on receiving, it in a reflecting surface. In case if the surface not reflect IR radiation(Black surface obsorbs IR). the input to the photo diode becomes nil, and photo diode wont work and hence the circuit.

inform.mayaprasad@gmail.com

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