The MCP2122 is a self-contained infrared encoder/decoder based on IrDA standard and is pinout-compatible with the Agilent® HSDL-7000 encoder/decoder. The device contains two interfaces: the host UART ...

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 ...