The ultrasonic ranging circuit

Published:2011/6/3 9:29:00 Author:Seven | Keyword: ultrasonic ranging | From:SeekIC

The circuit in Figure 9.12 can be used to measure the distance of 10mm~3m. This circuit is made of LM1812 special integrated chip, the external circuit is like the circuit in Figure 9.11-2, the secondary coil of transformer T and the 500pF capacitor of C1 are modulated in the frequency of 50~60kHZ, while L1 is also in it. From the oscilloscope, we can see the maximum echo sensitivity on 1-pin. The step-up transformer t1 can provide with a bias voltage of 150v for the matrix converter.



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