IR Link II

Posted on Jun 1, 2012

A basic Imfra Red Link for audio communication for distances upto 3 metres. Transistors can be replaced with 2N3904 and 2N2222. In his circuit Milan has created a basic Infra Red transmitter and receiver. The transmitter comprises a single amplifying stage driving two series connected IR LEDS.

IR Link II
Click here to download the full size of the above Circuit.

The input source is connected to J1. Please note that the device will pass a small DC current through it and also directly bias the transistor. A suitable device is therefore a high output crystal microphone. These can produce high output voltages up to 1

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