Vibration burglar alarm circuit

It uses the HL-169B-type voice alarm IC A. It can be used for safe, glass doors, car doors and windows burglar alarm and other occasions. When the thieves beat with violence such items that vibration of the piezoelectric ceramic sheet A, crystal thyristor V

turned on, the alarm issued a "Catch thieves!" The voice alarm. Only press the release button SB, the alarm was lifted.

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