[sdiy] AC Adapter - Getting Negative Voltages?

[mark verbos]

Or use a DC-DC converter like Roland stuff does. I have used a  
PT5062A to success. It takes a 5-14 volt DC signal and gives out +/-15.
Sadly, they're about $20.



Or make one yourself like this Buchla one http://www.simple- 
answer.com/214_schem.jpg
That will probably be more than $20 after all is said and done.


Mark




On Oct 27, 2008, at 4:36 PM, David Moylan wrote:

> 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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