[sdiy] Really Small Linear Power Supplies ?

[George Hearn]

One very sensible option for a small efficient power supply is to use a
'wall wart' giving say 12V unregulated, probably the cheapest kind.  Then
use a monolithic DC/DC converter module to yield +/-15V out from 12V in.  If
the ripple is too much simply follow the DC-DC converter module outputs with
linear regulators.  Because the voltage drop across the linear regulators
can be made to be small, the linear regulators won't dissipate much power
and hence won't need big heat-sinks if any heat-sink at all.  George

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of John Mahoney
Sent: 28 October 2008 00:10
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Really Small Linear Power Supplies ?

You can't find a power supply that's small enough for your enclosure? 
I missed your original post. Why not use a "wall wart" or "lump in 
the line" solution?

Another possibility is to rearrange the components of a supply that 
would fit *if* it were laid out differently.

Finally, you could build your own. There are plans for a +/-15V power 
supply in the sample chapter of Thomas Henry's e-Drum book:
	http://www.magsmoke.com/MSE/DrumCookbookSample1.pdf

Finding a really small transformer may be the hardest part.

John

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