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Power supplies and Touch

Posted by John Swenson (A) on November 7, 2010 at 18:03:49

In Reply to: RE: Well posted by rick_m on November 6, 2010 at 14:19:22:

I've done a lot of measuring and listening to different supplies with the Touch and other SB devices.

My major conclusion is that they have relatively little to do with the quality of power reaching the circuitry in side. They have far more to do with the noise injected back into the power line which can get picked up by other devices in your system.

The switching supplies almost all inject a certain amount of noise back into the line, but linear supplies can vary WILDLY as to how much noise gets injected into the line. It is NOT true that linears are noiseless, some will inject far more noise into the line than a good switcher.

I have designed a supply which is specifically geared toward reducing the noise injected into the line. A version of this was posted here a year or so ago. I have a schematic for one designed specifically for the Touch, its at:
http://home.comcast.net/~johnswenson1/stereo/SB_5V.GIF

I made a post to the slimdevices Touch forum that goes into a fair amount of detail on this subject at:

http://forums.slimdevices.com/showpost.php?p=586042&postcount=35

Unfortunately nobody commercially makes anything close to this design, so you have to make it yourself.

John S.

This post is made possible by the generous support of people like you and our sponsors:

Atma-Sphere Music Systems, Inc.

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