[sdiy] AC Adapter - Getting Negative Voltages?

[ASSI]

On Montag 27 Oktober 2008, 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.

The easier route would probably be a DC/DC converter if you already 
have the DC somewhere or an open frame AC/DC if you don't.  Have a 
look at http://www.tracopower.com to get an idea of your options.  
There are many more suppliers of these, this was just one where I did 
know the link and had datasheets at hand.  The AC/DC 12VA openframes 
for PCB mount are about 1.5"x2.5"x1.0", BTW.


Achim.
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