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How diode, zeners and LED tester works?

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001:
Hi!

Is diode and LED testers a sort of current source or voltage source?

I`m looking for simple project to test my LEDs and zeners

Zero999:
They'll be constant current sources or perhaps the cheap ones will just use a resistor.

What voltage range zeners do you want to test? Most diode testers have an open circuit off under a fer volts, so aren't much good for testing the reverse breakdown voltage of zener diodes.

AngraMelo:
Usually constant current
here goes a project that I build and works like a charm!

queennikki1972:
I built this version with a transformer, its overkill (one of my first projects, didn't know any better) but does the job for all zener diodes up to 27v....

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