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Audible tester

Audible tester
The tester, which is very useful for testing parts of electronic circuits consists of an oscillator that generates a 1 kHz test signal and a detector that amplifies the detected signal which is then made audible by a smallloudspeaker or buzzer. The tester draws only a small eurrent so that it ean be powered by a 9 V (PP3 or 6F22) battery
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