The ultra-sonic wave receiver circuit of distance detection

Published:2011/7/6 23:18:00 Author:qqtang | Keyword: ultra-sonic wave, receiver circuit | From:SeekIC

The working voltage of the circuit is 9V, and its current is only 5mA, its frequency is in the range of 150~180kHz, the band width is about 20kHz, which make sure that only the pulses whose band width is over 70μs is passable and amplified. The input terminal of the receiver is directly connected with the sensor, i.e it is connected with the oscillator. When the ultra-sonic wave signal appears, the signal voltage on the basic pole of T1 is limited to a low value by the diodes D1 and D2. The transistors T1 and T5 compose the 2 stage high frequency amplifier, and then the pulse is rectified by D3.



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