ULTRASONIC PEST REPELLER


Posted on Feb 5, 2014

The device emits ultrasonic sound waves that sweep between 65, 000 and 25, 000 hertz. Designed around a 556 dual timer, one half operated as an astable nultivibrator with an adjustable frequency of 1 to 3 Hz. The second half is also operated as an astable multivibrator but with a fixed free running frequency around 45, 000 Hz. The 25-65 kHz sweep is


ULTRASONIC PEST REPELLER
Click here to download the full size of the above Circuit.

ac-complished by coupling the voltage across C2 (the timing capacitor for the first half of the 556) via Q1 to the control voltage terminal (pin 11) of the second half of the 556. The device that radiates the ultrasonic sound is a piezo tweeter.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

alarm using PIC16F628-04
Fuzz Face
Variable Square wave oscilator with 555 circuit
PLL FM Demodulator Circuit Module
clap switch
what relay should i use parallel port
Flash Trigger
A typical laptop power adapter circuit
Adjustable output voltage regulator type rectifier circuit times
LED display driver circuit a
DC arc welding machine no-load power path from 2



Top