Warble-tone alarm


Posted on Jan 13, 2013

The circuit generates a warble-tone alarm signal that simulates the sound of a British police siren. IC1 is wired as an alarm generator and IC2 is wired as a 1 Hz astable multivibrator. The output of IC2 is used to frequency modulate IC1 via R5.


Warble-tone alarm
Click here to download the full size of the above Circuit.

The action is such that the output frequency of IC1 alternates symmetrically between 500 Hz and 440 Hz, taking one sound to complete each alternating cycle.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Mono audio panoramic interference (pan pot)
Rain warning beeper
555 IC PWM Motor Control with Current Limiter
analog pid control using opamps
btr200
boarduino wii nunchuck servo
temperature controller using ds1820 and lcd display
High Input Voltage Linear Regulator
IR Widget Consumer infrared remote control capture and visualization



Top