[sdiy] Negative voltage references

David G Dixon dixon at mail.ubc.ca
Sat May 19 19:53:59 CEST 2012

> Ideally, anything you hang off it will need to be via an op 
> amp buffer.

That's really important.  One must take a close look at the current specs
for whatever is used.  LM4040 is pretty low.  REF02 is better.

For me personally, the best practice is to buffer and invert any reference
voltage with a dual opamp, and then you can use any single positive
reference and you don't have to worry about it.

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