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Basic alarm circuit using 555 timer

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Uploaded on Apr 5, 2010

A very basic alarm circuit using a 9V battery.
Green led as power ON indicator.
Flashing yellow led with a buzzer for the alarm. However in this video, the buzzer did not sound. :)
Red led for halt indicator. When switched on, the yellow led will stop flashing and the buzzer will stop buzzing. Vice Versa.

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