@▷ Magnetic Reed Switch Alarm Circuit Schematic Diagram | Diagram for Schematic

Magnetic Reed Switch Alarm Circuit Schematic Diagram

This circuit can be used as an anti-theft alarm. It can be placed inside a bag, on door, or windows. If the magnetic looses its contact, the SW1 will open and then the circuit will start oscillating to sound loud alarm. Here is the circuit schematic diagram :

magnetic reed switch circuit schematic diagram

A complementary transistor-pair which is wired as a high efficiency oscillator, driving a small loudspeaker. Low part-count and 3V battery supply enable compact construction. [Source : english.cxem.net]

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