Schematics > Security and other sensors and detectors > Factory Siren
Factory Siren
This circuit produces a sound similar to a factory siren.
It makes use of a 555 timer Ic used as an astable multivibrator of a center
frequency of about 300Hz.
The frequency is controlled by the pin 5 of the IC. When the supply is switched
ON, the capacitor charges slowly and this alters the voltage at pin 5 of the IC
hence the frequenct gradually increases.
After the capacitor is fully charged, the frequency no longer increases. Now
when the push button siren control switch is held depressed, the capacitor
discharges and the siren frequency also decreases.
The presets VR1 and VR2 should be adjusted for optimum performance.
Title: Factory Siren
Source: www.electronic-circuits-diagrams.com
Published on: 2005-02-01
Reads: 426
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