@▷ Burglar Alarm Schematic Using IC Timer 555/556 | Diagram for Schematic

Burglar Alarm Schematic Using IC Timer 555/556

The following circuit diagram of burglar alarm using IC timer 555/556 is functioned as an alarm to prevent thief entering your house. The alarm would produce loud sound when a thin wire connecting resistor R1 with IC pin no 4 is broken. Thin fiber is used as the wire. The thinner the wire, the more responsive the alarm. This circuit needs 5-15V power supply, buzzer is used as a speaker. Here is the circuit schematic :

anti-theft burglar alarm circuit schematic

Parts list :

  • Resistor R1 : 10k
  • Resistor R2 : 68k
  • Resistor R3 : 1k
  • Polar capacitor C1 : 1uF/15 B
  • Capacitor C2-C3 : 0.01uF
  • IC Timer : NE555
Power supply 12V

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