Factory Alarm


Posted on Feb 6, 2014

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 capaci


Factory Alarm
Click here to download the full size of the above Circuit.

tor discharges and the siren frequency also decreases.




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