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LM567 Infrared Transmitter Circuit

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This infrared transmitter use PWM (pulse width modulation).
The transmitter is equiped with LM567, tone decoder circuit. Audio signal ( at least 50mVvv ) is amplified with T1 and then it is used to modulate IC1. Infrared transmitter frequency is adjusted with P2 between 25 and 40KHz.

IR transmitter circuit diagram

infrared transmitter circuit schematic

LM567 datasheet
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3 Responses to “LM567 Infrared Transmitter Circuit”

  1. sidharth says: on November 3, 2009 at 5:01 pm

    this circuit is a little bit complicated.. using a 555 timer and a few resistors and diodes makes the circuit a lot simpler easy to construct thereby reducing the cost factor also.
    • Marius says: on November 3, 2009 at 6:12 pm

      @sidharth – do you have the infrared transmitter circuit you are talking about? We would like to present it on the website, thanks a lot.
  2. mehdi from iran says: on December 3, 2009 at 6:55 pm

    thank yuo its very good

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