Continuity Tester

Posted on Nov 13, 2012

A continuity tester that has an audible indicator can be more useful in some cases than a visual indicator, because you n

Click here to download the full size of the above Circuit.

eed not take your eyes from the job at hand, Ql and Q2 form an audio oscillator. When the test leads are connected to a continuous circuit, the oscillator operates, and sounds a tone from the speaker.

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