Schematics > Security and other sensors and detectors > Beeper
Beeper
This circuit produces the sound of a beeper like the one in pagers which
produces a "beep-beep" sound. Basically the circuit consists of a 555 timer
oscillator which is turned ON and OFF periodically.
The first IC(left) oscillates at about 1Hz. The second IC is turned ON and OFF
by the first IC.
The first IC determines how fast the second IC is turned ON/OFF and second IC
determines the tone of the final output.
By varying the VR1, the changeover rate can be adjusted. By varying VR2 the tone
can be adjusted.
If you know something about electronics, you can try replacing the 2nd 555 IC
circuit with a piezoelectric buzzer. This saves one IC and associated components
but the buzzer cannot give a loud sound as the speaker and also its tone cannot
be varied.
Title: Beeper
Source: www.electronic-circuits-diagrams.com
Published on: 2005-02-01
Reads: 454
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