MOTM

On 6/27/07, michael stein put forth:
>
>My .COM filters and amps have been putting out a good load of
>noise/hums lately and Paul your filters don't seem to do this. Any
>tips on what might be the problem. (or difference?) p.s. and no
>there not self oscillating.
>Thanx,

It sounds like a power supply problem.  One great thing about the
Synthesis Technology modules is that they have much better shielding
and grounding than Blacet, CGS, Oakley, etc.  All those little
considerations -- a PCB's with a zero-ground plane, ground
connections for each jumper, .1uF bypass caps on the power pins of
most IC's, etc. -- add up to reduce noise.

Regardless, the power supply filtering on each module is
supplemental, as your power supply should not be producing hum in the
first place.   Are you sure that it is working properly??  I once
bought a bad power supply and had to send it back to get new one.