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The LM I812 is a complete ultrasonic transceiver designed on a block chip for a variety of pulse echo ranging applications. The chip works by means of a converter, by transmitting an oscillating pulse. Then use the same converter to listen for the returned echo. If the received echo signal has sufficient amplitude, the LM1 8 I2 detector will send a pulse of approximately the same width as the original pulse, and the closer it is to the blocking object, the shorter the return echo will be received. Ultrasonic transducer drive and receive circuit composed of LMISI2: 