TL431, variable zener diode

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Hugo
Posts: 187
Joined: Sun Feb 28, 2021 10:20 am

TL431, variable zener diode

Post by Hugo »

https://www.youtube.com/watch?v=isutYMU2HHU

I was watching this video from the channel GreatScott, a German guy with a thick accent and a lot of electronics knowledge.
Any way, it is about a little component that looks like a small signal transistor but is a variable zener diode. And the first thing that came to my mind was: what a cool little device is this that can be used to bias a tube. The requirements are a peak current of less than 100mA and a (Bias) voltage between 2,5V and 36V across the TL431. I think this could be a good alternative for the LED's you find in driver and pre amp tubes. More elegant and no faffing about with matching specially selected components plus it is supposed to be very stabile. The TL431 would then replace the LED + the series resister of it. But it takes two resisters to define the zener voltage so the parts count goes up by one resister. I hope you guys and gals find it interesting as well.
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