Simple IR audio link

Posted on Feb 5, 2014

Here is a simple IR audio link that can be used to transmit audio signals up to 4 meters. The signal to be transmitted is applied to the base of Q1 via resistor R4. The transistor Q1 drives the IR transmitting diodes D1 and D2. The audio input will be modulated to the IR signals transmitted. The transmitted IR signals will be picked by the photo tra

Simple IR audio link
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nsistor Q2. The emitter voltage of the transistor Q2 will change according to the sound modulated to the IR signal. The transistors Q3 and Q4 amplifies this signal to drive the speaker or headphone. C1 and R3 forms a filter to avoid interference from stray IR signals.

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