Digital/Standard Phone Line Tester circuit

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Digital/Standard Phone Line Tester

Example: Infrared control system

Electronic circuits archive

Digital/Standard Phone Line Tester

Source: http://www.ee.washington.edu/

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CONTINUITY TESTER. Among the essentials for circuit design and prototyping is the continuity tester, a simple device which provides an audible indication when a sufficiently low resistance is applied between its input probes. This version has a feature which automatically turns off the tester after about two minutes, thereby saving the 9 volt battery from inadvertent discharge.

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