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Dave's Circuits
Circuits designed by David Johnson, P.E.

Master Category List - Dave's Circuits
Last Updated on: Monday, April 21, 2008 04:18 AM


Delay Circuits
LONG PERIOD COMPUTER WATCH DOG TIMER
This circuit uses a simple 4060 IC oscillator/timer that is reset periodically by a computer. Should the computer fail to send a pulse, the output changes state. The time can easily be set from seconds to hours.

Click on Drawing Below to view PDF version of Schematic

5 Minute Watchdog Timer designed by Dave Johnson, P.E. (Dec 26, 1998)

Delay Circuits
Master Schematic Category List - David A. Johnson, P.E.
 

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