Infrared transmitter circuit schematic

This infrared transmitter use PWM , puls width modulation.
The transmitter is equiped with LM 567, 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.

infrared-transmitter-schematic1

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