Author Topic: How diode, zeners and LED tester works?  (Read 1357 times)

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Offline 001Topic starter

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How diode, zeners and LED tester works?
« on: December 05, 2018, 12:50:06 pm »
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
 

Online Zero999

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Re: How diode, zeners and LED tester works?
« Reply #1 on: December 05, 2018, 05:12:00 pm »
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.
 

Offline AngraMelo

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Re: How diode, zeners and LED tester works?
« Reply #2 on: December 06, 2018, 04:12:07 pm »
Usually constant current
here goes a project that I build and works like a charm!

 

Offline queennikki1972

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Re: How diode, zeners and LED tester works?
« Reply #3 on: September 22, 2019, 03:35:48 pm »
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....
« Last Edit: September 22, 2019, 03:41:47 pm by queennikki1972 »
Siglent SDS 1202X-E - Heathkit IO-4105 - Dr. Meter 0-30v 5a power supply - 862d+ combo unit - Weller WLC100 - Kunkin KL283 DC load. Not much gear yet.
 
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