Timer with alarm

Posted on Jun 2, 2012

The circuit has two ranges: 10 sees to 5 mins and 1 min to 80 mins. It can be powered by a 9-V battery. With the LED connected as shown a reasonable frequency of flashing occurs throughout the range of operation.

Timer with alarm
Click here to download the full size of the above Circuit.

This circuit is reset when S2 is closed.

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