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

[Peter Grenader]

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.