continuity tester

135

01:40:48

Lamp = speaker
q = BD170b / 174b

published 11 years ago

thebugger

11 years ago

Ive had a similar circuit posted here. It's good for conductance testing but I have a small remark. The speaker should be a high impedance one like from a phone or something because a 4ohm speaker may pass a large amount of current through the transistor and pass beyond its rating.

mircea_str8

11 years ago

25 ohmi

thebugger

11 years ago

I used 260ohm.

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