Menci alarm produced schematic circuit diagram

  
The alarm circuit shown: alt="Menci alarm produced schematic circuit diagram"> Turn the power switch SW1, alarm electrical work.
Menci alarm produced schematic circuit diagram - schematic

When the magnet is brought near the spring, the spring field magnet attracted to the magnet side, dynamic and static switch segment is turned on, the system is in warning status. When the magnet is removed after the spring loses magnetic field, back to the original position, then static and dynamic contacts open, starting the police, IC1 receives an alarm signal, the timing resistor R1, the internally generated audio signal, the signal output end, fed VT1, power amplification, the audio signal amplified by the boost inductor coupled into a high voltage audio signal to drive the buzzer loud alarm signal.




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