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  2. Nonlinear junction detector - Wikipedia

    en.wikipedia.org/wiki/Nonlinear_junction_detector

    The detector has a sensitive receiver tuned to these harmonics, as well as appropriate processing and displays to make their presence known to the user of the device. Because the basis of almost all semiconductor electronics is the p-n junction, an NLJD is correspondingly capable of detecting almost any unshielded electronic device containing ...

  3. Test light - Wikipedia

    en.wikipedia.org/wiki/Test_light

    A non-contact tester which senses electric fields cannot detect voltage inside shielded or armored cables (a fundamental limitation due to the Faraday cage effect). Another limitation is that DC voltage cannot be detected by this method, since DC current does not pass through capacitors (in the steady state ), so the tester is not activated.

  4. Inductive sensor - Wikipedia

    en.wikipedia.org/wiki/Inductive_sensor

    An inductive proximity sensor is a non-contact electronic proximity sensor. It is used for positioning and detection of metal objects. It is used for positioning and detection of metal objects. The sensing range of an inductive switch is dependent on the type of metal being detected.

  5. SearchTempest - Wikipedia

    en.wikipedia.org/wiki/SearchTempest

    SearchTempest is an aggregator of online classified advertisements that allows users to search results from craigslist, eBay, and Amazon.com together. [1]Created in 2006 by Nathan Stretch, SearchTempest was originally named Craig's Helper and was made to help users search more than one craigslist city at once. [2]

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  7. Current sensing - Wikipedia

    en.wikipedia.org/wiki/Current_sensing

    In electrical engineering, current sensing is any one of several techniques used to measure electric current. The measurement of current ranges from picoamps to tens of thousands of amperes. The selection of a current sensing method depends on requirements such as magnitude, accuracy, bandwidth, robustness, cost, isolation or size. The current ...