Burglar Alarm Circuit by 2N2222
At this period the economy not good, Make have steal plentiful. We come to try build the circuit steal model to is simple better. The Alarm Sound (Super Bell) loud forever until will cut power supply to go out. When the Switch of the magnet Senate was opened or strip metal torn. The R1 stand give get the maximum score. Discharge late beside one of the the Switch of the Senate or zone metal goes out. Devalue R1 until will begin change the dot is born the sound. [...]
source: Burglar Alarm Circuit by 2N2222
