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Cell Phone Activity DetectorThis circuit supposedly detects nearby cell phone activity and lights the LED in the circuit when it's detected. Seems simple enough, and could be very useful for those wanting to detect when a phone rings, gets or sends a message, etc. I haven't tested it, however, and it looks like it could be a bit finicky about the antenna shape and length. Thanks to James Tu for the link. Posted by tigoe at December 24, 2004 09:45 AM |