[sdiy] +15 -15 volts from 9volt dc power supply?

[Jeff Farr]

I've been looking into to this kind of thing as well. I'd like to make some 
kind of battery pack to power the 808 clone I'm working on. Ideally I'd like 
to use rechargeable battery packs like you can get from mouser, but am 
unsure to how much power will be needed for a synth. It was my understanding 
that switched power supplies required special consideration in audio 
applications, perhaps I'm wrong?

On 9/7/05, Peter Grenader <peter at buzzclick-music.com> wrote:
> 
> The Buchla 200e dual powered boat has an very interesting little power
> converter in it made by TI's Power Management (called Power Trends)
> division. It takes the output of a 7.5 VDC wallwart and gives you +/- 15
> out, switched. The unit is self-contained, all SMT, and about 1/2 x 2
> inches by about 1/4 inch high in size. They cost about $13 USD.
> 
> The 15 volt model is a PT5062
> 
> there's a 5 volt model - PT6202
> 
> datasheets can be seen here:
> 
> Arrow and Digikey stocks them.
> 
> hope this helps,
> 
> - P
> 
> 
> 
> 
> 
> Tom Arnold wrote:
> 
> > On Wed, Sep 07, 2005 at 06:36:57PM +0100, Milo Barrowclough wrote:
> >> im trying to get+15 -15 volts for cheap to power my diy synth modules.
> >> Is it possibe to convert 9 volts dc (from a regular plug-in power
> >> supply) to a dual voltage +15 -15 volts? Surely it must be possible
> >> because the roland sh-101 uses a 9v dc power supply (or 9v dc
> >> from batteries). this must be converted to +15-15 volts somehow for
> >> powering the cem3340.
> >
> > Pretty easy actually. Well actually, not with the 9vdc wallwart, but you
> > should easily be able to find a cheap 12vac one.
> >
> > Have a look at the power supply on this EFM schematic :
> > http://www.ele4music.com/pdfs/seq2a.pdf
> >
> > Basically two half-wave rectifiers. Feeds the top half of the AC voltage
> > swing to the positive regulator and the bottom half of the swing to the
> > negative. You can do +-15 with a slightly higher voltage transformer and
> > different regulators. Not good for much current but really cheap.
> >
> > If you are going to power several modules, see if you cant pick up a
> > pre-made supply of some kind. I use Power One brand units. The +-15volt
> > unit is good for an amp or so which is enough for several modules, they 
> are
> > well made and cheap on ebay. I dont see any on your side of the pond 
> right
> > now, but there are other manufacturers also and I'm sure you can find 
> one
> > fairly cheap. They're a little pricey to buy new but maybe someone else
> > will have a suggestion on that.
> 
>
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