>   I'm looking for a +/-5 V power supply.  I'd like to be able to run it
    off a 12 V battery, but at this point, even AC is an option.

    No problem, you're saying.  Dozens, pick one.  Here's the problem: the
    circuit is EXTREMELY sensitive to supply noise.  Right now we're using
    a $2000 lab supply, which has <2 mV ripple.  It works.  I have managed
    to make a 5 mV ripple regulator, but it still isn't good enough.

Shouldn't you be able to add arbitrarilly low-noise filtering to any
existing power supply?  (for reasonable low current consumption, anyway.)
Nice cascades of inductors and filter caps and perhaps additional
regulating devices or something?  Is ripple the same thing as noise?

BillW

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