[sdiy] AC Adapter - Getting Negative Voltages?

[David Moylan]

Which type are you talking about?  AC coming out of the barrel plug (or 
other type of plug) or DC coming out of the plug?  For the AC type it's 
your choice how to set up your rectifiers.  For the DC type I suppose 
you could reverse the leads.

ElectroHarmonix used some higher voltage single supply DC wallwarts and 
floated them so they had a +- supply relative to the signal ground. 
Have to use the plastic female ends for those in a metal chassis.

Dave

Ken Elhardt wrote:
> Since nobody seems to know of any really small power supplies, as per
> my previous post, I have question about AC adapters.  How does one get
> a negative voltage from one?  Is there some kind of negative voltage
> regulator that works off a positive voltage?  Or do you use the
> positive voltage as ground, and ground as a negative voltage somehow?
> Thanks for any info.
> 
> -Elhardt
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