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Time delay door alarm



Time delay door alarm
Ever accidentally left your front door ajar and had a pet escape? [BlackCow] came up with a simple solution to this problem. The circuit is fairly rudimentary but a great example of using the basics to get the job done.
Via Hack a Day, Published: 2010.03.07


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http://hackaday.com/2010/03/06/time-delay-door-alarm/