Why Don't We Have NEGATIVE Zener Diodes?

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We all know how Zener Diodes work yeah? Well if you don't then check out this video All You Need To Know About Zener Diodes To Fix Stuff
   • All You Need To Know About Zener Diod...  
But the question here today is why do we only have positive zener diodes. I mean, we do also need to have negative supplies and htey do need regulating... well let's take a look at this and see if we can work out why.

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