> > I'm not trying to be a smart-ass,
>
>Nor, am I. But this sounds like a band-aid job to me.
>I would think that the circuit that can't endure a 5mV ripple is the real
>problem.
>That's where I would be investing my effort. Perhaps as ripple, perhaps
>not,
>but 5mV supply irregulariites can be induced or otherwise introduced by
>many
>unexpected means. Instead of having to deal with the snakes that will
>appear
>in the grass when the design is in real-world use, why not solve the
>problem
>at the root?

</insert comments from original poster here>
Believe me, I'd love to trash or redesign the circuit which needs the PS,
but I'm
afraid I don't have that option.  It's an expensive, off-the-shelf amplifier
unit for
signals acquired from electrodes implanted in the brains of lab animals, and
we
bought 5 of them without considering the ramifications (in fact, the
problems
which arose with these devices are in large part why I was hired).

Normally, a small control panel would be purchased with each one of these,
and
those contain the necessary power supply.  However, those are $900US each,
and we can justifiy spending $4k or more just to power these little things,
when
we already have the other bits we need (gain amp, filter, etc.) which are
the
expensive part of the interface panel.

This leaves me with no real option but to build what I can to power these
insane
little buggers.  Grrrrrr.

Mike H.

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