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.
Ranging-system - schematic

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.

Recommended videos

  • Simple Audio Amplifier Project using LM386 | Electronic Devices and Circuits | University Projects
    Duration: 0:48.
  • ultrasonic sound generator (3-4 W) with tweeter (schematic)
    Duration: 5:25.
  • Ultrasonic Signal Generator Circuit - Beijing Ultrasonic
    Duration: 6:32.