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ThermalRunaway said:I've never considered using an LED as a voltage reference. I'm assuming you use the 2V drop across the LED as the reference. I wouldn't have thought that was very accurate?
Nigel Goodwin said:It's quite common, probably as good as a low voltage zener?, perhaps even better?. You see then in quite few things, some Sky digiboxes have them internally, some audio amplifiers do - and (the first time I ever say them used in this way) the very old Ferguson TX10 colour television! - where it's used as a reference voltage on the CRT base.
ThermalRunaway said:Thinking about it, you can get low current LEDs and you certainly wouldn't bother to use a high brightness one as a reference so it probably isn't less efficient to use an LED rather than a Zener afterall.