Posted on Jun 18, 2012

Combine an electrostatic transducer with an ultrasonic transceiver IC to build a ranging system that senses objects at distances from 4 inches to more than 30 feet. Transducer Yl `s broadband characteristic simplifies tuning. The secondary of T1 resonates with the 500-pF capacitor Cl at a frequency between 50 and 60 kHz.

Click here to download the full size of the above Circuit.

You tune L1 to this frequency by using an oscilloscope to note the maximum echo sensitivity at pin 1. Step-up transformer T1 provjdes 150-V bias for the transducer.

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