[sdiy] Negative voltage references

[blacet at blacet.com]

Yes, pos through an op amp; low offset maybe?

Lots of refs out there; look at the LM4040 series for example. Various
trimmed grades, one resistor, no cap.

> Hi all,
>
> What do people do for negative voltage references?
>
> Farnell list 1351 voltage references on their website, and only one of
> them is negative (-10V).
>
> Are we expected to use a positive one and stick it through an op-amp?
>
> Or should I just use a 3-pin negative voltage regulator instead? It's not
> great, but it's cheap, and you can get negative ones easily enough.
> REF02's seem to cost £3-£4 each, which I regard as a lot of money for the
> job. A separate regulator costs me £0.30 or so.
>
> All that talk about not using the rails for references must finally be
> getting through to me! But unless I can find one, I'm in danger of
> slipping back into my bad old ways.
>
> Thanks,
> Tom
>
>
>
>
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