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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

Select link https://www.seattleu.edu/scieng/ece/l... for assembly instructions, schematics, parts lists and costs, distributor lists, and more...
The circuit seems to work fine for 3G phones on any wireless carrier or newer 4G phones on the USA Verizon, AT&T, and Sprint carriers. The older phone shown in the video only supported 3G GSM mode and that seems to detect well. With a newer Samsung Note 2 phone in CDMA LTE mode and on wireless carrier T-Mobile this circuit did not detect well but other have made it work well on Verizon and other wireless carrier or in other cities. When I placed the phone in GSM mode the circuit worked on fine on T-Mobile just like the video shows. When time allows I'll create an updated circuit to support the newer phone modes and post it or please post your circuit here (if it works better).
Select link https://www.seattleu.edu/scieng/ece/l... 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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