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Build Your Own Electronic Key Card Lock

Posted by michael on from the friday-night-build-your-own-series-continues dept.

edBX writes "GideonTech.com has a new guide up on how to make your own electronic lock using a key card. Built using a phototransistor, infrared-emitting diode and a few ICs, they are able to turn on their computer using a punched out phone card."

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