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Quoth · 12-17-2024, 05:37 AM

I think the Zener voltage is about 5V on some old LEDs and maybe over 170V on others. Many seem to be 20 to 40V.
I'd connect an LED to a 0 to 30V PSU via 100K, DMM across LED (decent ones are 20 M Ohm) and measure.

12-17-2024, 05:37 AM	#239
Quoth Still reading Posts: 14,447 Karma: 107078855 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper	I think the Zener voltage is about 5V on some old LEDs and maybe over 170V on others. Many seem to be 20 to 40V. I'd connect an LED to a 0 to 30V PSU via 100K, DMM across LED (decent ones are 20 M Ohm) and measure.