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My LM358 Cell Phone RF Detector PUBLICCell Phone RF Signal Detector-Sniffer. Easy fun circuit for beginners & hobbyist. More info at http://www.seattleu.edu/scieng/ece/CellPhoneSignalDetector.html by fernandg | updated October 16, 2012 beginners cell-phone-detector electronic-hobby-circuit hobby-electronics lm358 op-amp |