RANGING_SYSTEM

Published:2009/7/8 23:19:00 Author:May | From:SeekIC

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 Y1's broadband characteristic simplifies tuning. The secondary of T1 resonates with the 500-pF capacitor C1 at a frequency between 50 and 60 kHz. You tune L1 to this frequency by using an oscilloscope to note the maximum echo sensitivity at pin 1. Step-up transformer T1 prov.ides 150-V bias for the transducer.



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