Continuity Tester based around a 555 IC

Thread Starter

RodneyB

Joined Apr 28, 2012
697
I am trying to build a continuity tester and have found the attached circuit diagram on the internet with good reviews. I have some confusion.

In the article they talk about a 12 Volt Pizeo Buzzer. However the circuit diagram shows an 8Ω Speaker so a little confused.

Would any additions or alterations be suggested

Thank you in advance
 

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#12

Joined Nov 30, 2010
18,224
Yes.

Apply 5 to 15 volts DC to anything, with the negative end of the power supply connected to the ground of the circuit above, and connect the positive end of the circuit to the "anything". If continuity, then buzz.
 
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