DIY Simple Circuit Tester (Continuity Tester with Buzzer)
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This simple circuit tester is used to determine if an electrical path of current can be flow between two points.
Continuity tester is a device indicator in series with battery, buzzer, and two leads or copper. It tests whether the circuit connected each other or not.
You can make this simple circuit continuity tester at home. What you need are cables, battery, buzzer, and coppers.
When there is presence of a complete path for current flow in circuit the device will buzz.
Beware electric shock when testing on live circuit!
For more details: https://youtu.be/psaMmVtUE_w