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The infrared reversing radar is composed of a multi-resonant circuit, an infrared signal transmitting and receiving circuit, an infrared signal amplifying and a voltage comparison circuit. It has the characteristics of simple circuit, stable circuit operation, and is widely used in various ranging occasions. High quality PCB, has clearly marked the electronics components, even beginners can easily solder successfully. This soldering practice board is easy to assemble and funny, exactly suitable for the electronic learner and school teaching.