Simple Continuity Tester (CB14989E)

Details
Written by: Newton C. Braga

 

The indicator for this circuit is a mini buzzer with a 1.5 V oscillator. The circuit can also be powered with 3 V for buzzers of this type. The transistors can be the BC548. We found this circuit in an old Poptronics from the 90s.

 


 

 

 

  

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