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Tuesday, March 30, 2010

SIMPLE IR AUDIO LINK

  1. Here is a simple IR audio link that can be used to transmit audio signals up to 4 meters.
  2. The signal to be transmitted is applied to the base of Q1 via resistor R4.
  3.  The transistor Q1 drives the IR transmitting diodes D1 and D2.The audio input will be modulated to the IR signals transmitted.
  4. The transmitted IR signals will be picked by the photo transistor Q2.
  5.  The emitter voltage of the transistor Q2 will change according to the sound modulated to the IR signal.

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