[sdiy] recommendations for bench supply?

[Grant Richter]

> That leads me to a more general question: how do op-amps, OTAs etc  
> behave when suddenly one of the supply rails go to GND, but the  
> second rail stays up? Can that do any damage to the parts?

Yes it can.

If you suddenly ground the +15 volt rail, the positive charges stored  
on caps in the module may now go negative relative to ground.
(this is how charge pumps work, charge a cap to +15, ground the +  
side and the ground side is now at negative 15)

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