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Continuity tester

Continuity tester
Most ohmmeters and cable testers have either a moving-coil meter or a liquid crystal display (LCD). The circuit described here presents a viable alternative to these traditional indicators. A row of six LEDs is used to indicate resistance values between 10 ohm and about 1 mega-ohm, while a buzzer and another LED are activated when a resistance value between nought and 2 ohm is measured.
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