[sdiy] Negative voltage references

[Neil Johnson]

Hi Tom,

> As I said, I'd have used a 79L05 if I'd had one. The chunky 7905
> isn't doing the job without enough current pulled out of it.

Well, even the 79L05 has a minimum current requirement.  According to 
the TI/NS datasheet it's only 1mA, but it's still a requirement to be in 
spec.

Cheers
Neil
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