[sdiy] Reverb picking up power supply hum

[ASSI]

On Freitag, 24. April 2009, Scott wrote:
> If I mount my power supply (power-one 3 amp) inside my synth
> cabinet, I pick up some hum in my reverb (tellun neural agonizer). 
> I've tried grounding the power supply frame to earth.. the reverb
> tanks to earth..  various grounding schemes using the synths
> neutral line, etc.

That's a spring reverb, right?  If so, it's probably picking the hum 
up via magnetic fields which means you can ground away until you're 
blue in the face.  Electrical shielding also doesn't help with that.

> Is there anything I can do?  There isn't a lot of room but I might
> be able to fit the p.s. inside a cage if that would help.

Try changing the orientation of the PSU and put the reverb tank as far 
away as possible from it.

> I know building a little case for my power supply and leaving it
> external would work, but that is definitely the last thing I will
> do.

You don't have any mu-metal shell for the PSU handy, do you? :-)


Achim.
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