This is an electronic siren.you can use this one to your security systems or burglar alarms.so be creative then you can build up a fantastic creation.
* A 12 V battery or a a well regulated 12V DC power supply can be used to power the schema.
* Assemble the schema on a good quality PCB or common board.
* The switch S1 can be used to activate the alarm.
* The switch S2 can be used as a power switch.
* You can experiment on the tone of alarm by using different values for C2 and R8.
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