How to make a Continuity Tester at home

A diode is a two-terminal electronic component that conducts current primarily in one direction (asymmetric conductance); it has low (ideally zero) resistance in one direction, and high (ideally infinite) resistance in the other.
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A different way to check whether diode and Transistors are working or not without any instrument
Hope you like it

chapters
0:00 Start
1:25 Cutting Glass Tube With a File
3:35 Assembling the tester
4:15 Testing the Diode and Transistors.

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Видео How to make a Continuity Tester at home канала AZ Electronics