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.

Leave Comment

characters left:

New Circuits



Popular Circuits

Mobile Phone Charger with CA3130
30 volts panel volt meter using pic mcu
vhf rf preamp 100 175 mhz with max2633
3 voltmeter method of measuring choke
park aid schematics
Motion Sensor Switch for Light
Monostable flip-flop circuit consisting of door
By the PGA204 205 op amp OPA602 programmable AC coupled amplifier