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2G/3G Cell Phone Detector - Detects when cell phone is active using simple OpAmp Circuit

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Published on Oct 11, 2012

Not recommended for phone use in modes CDMA and LTE. This circuit was built and tested on an older 3G GSM mode phone..
Select link http://www.seattleu.edu/scieng/ece/Ce... for assembly instructions, schematics, parts lists and costs, distributor lists, and more...
I don't recommend this circuit for the newer phone running in CDMA LTE modes. The circuit seems to work fine for phones set in GSM mode. When my Samsung phone is in CDMA or LTE mode this circuit does not detect well. When I place the phone in GSM mode the circuit seems to work just like the video shows. If time allows I'll create a better circuit and post it or please post your circuit here (if it works better).
Select link http://www.seattleu.edu/scieng/ece/Ce... for assembly instructions, schematics, parts lists and costs, distributor lists, and more... My cost to build $3.70 USD. This circuit is perhaps one of the simplest circuits that can be found to detect RF signals from cell phones and is designed for the hobbyist or student. All parts used are readily available on the market today. When I get a chance I'll build one that is more receptive to higher frequencies of 4G carriers. The circuit above was tested on a Google Nexus One 3G GSM mode T-Mobile service. International Students: http://www.seattleu.edu/isc/ | Home http://www.seattleu.edu

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