infrared transmitter circuit schematic

LM567 Infrared Transmitter Circuit

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


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