[sdiy] voltage reference advice

[David G. Dixon]

> 5.1 volt zeners are close to zero temperature coefficient. I use them on
> each module
> to power the front panel controls, so there can be no interaction from
> using the power
> supply rails for this purpose. I find them to be good enough, I don't use
> better regs unless
> I need them.

Yes, ~5V zeners have pretty low tempco, but it is a function of bias
current, which can be pretty high.  What current do you pull through those
zeners, Harry?