[sdiy] Curious powersupply/power distribution problem

[Karl Ekdahl]

Sbe

> Isolate the I/O with a small transformer?

Won't work with DC signals... also to expensive.

Karl

> 
> Karl Ekdahl wrote:
> > Hi list
> >
> > I have a problem, i'm making a stompbox that's
> being fed from a regular 9V transformer, internally i'm
> dividing it up to +-4.5V because i need a split powersupply.
> Now this is working perfectly, until someone plugs in one of
> those transformers that feed several stomps. At that point
> my ground and the other circuits grounds are 4.5V apart,
> problematically enough it won't work for me to (just)
> use opamps that can run from non-polar voltages.
> >
> > Now what i need to do is to make my circuit work with
> audio signals that aren't referenced to my ground, but
> in fact my -4.5V. I tried biasing each signal with +4.5V but
> that didn't work, to the problem belongs that i need to
> be able to use both AC and DC signals. 
> >
> > help!!!!!
> >
> > Karl
> >
> >
> >      
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> >


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