Ultrasonic circuit

Ultrasonic Range Meter by PIC16F873
8 Jan 2008 ... This circuit is measuring the range to an object by using ultrasonic
transmitter and ultrasonic receiver. The distance is calculated by PIC ...

Ultrasonic Pest Repellent by CD4013
27 Oct 2008 ... It is well know that pests like rats, mice etc are repelled by ultrasonic
frequency in the range of 30 kHz to 50 kHz.

Ultrasonic Parking Sonar by 4017
6 Feb 2008 ... It works on the sonar principle, sending an ultrasound burst and listening for
first echo. The burst generated by the oscillator built ...

Ultrasonic Parking Sonar by 40106
5 Oct 2007 ... Feautures: * automatic switch on on rear gear * led-bargraph display
* audible bleep on last led * good old design style, no.