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beernutz
2007-03-12, 19:47
Has anyone modded an ELPAC WM220-1 linear power supply in order to power a Squeezebox?

I know you can send them to boldercables and have them modded for $125 (http://www.boldercables.com/servlet/Detail?no=381) but I was wondering how difficult it would be to do just a basic mod to make the power supply SB3-compatible.

Any tips are much appreciated.

P Floding
2007-03-13, 09:51
Has anyone modded an ELPAC WM220-1 linear power supply in order to power a Squeezebox?

I know you can send them to boldercables and have them modded for $125 (http://www.boldercables.com/servlet/Detail?no=381) but I was wondering how difficult it would be to do just a basic mod to make the power supply SB3-compatible.

Any tips are much appreciated.

The "basic mod" consists of identifying the 5 volt lead, neutral lead and attaching the correct barrel connctor to these leads. You don't want to use the 12 volt supplies, just ignore them. (Make sure they don't short.)

http://www.elpac.com/products/commercial/external-triple/documents/wm.pdf

Jdubs
2007-03-15, 21:20
What caps are people using that fit in this case?

-Jim

AustinIsWierd
2007-03-21, 10:38
Hey Bob,

I just bought a WM075-1950 (+5V only) version...

Looked inside. VERY disappointed. Your very basic linear supply. AC->Transformer->half wave bridge->smoothing cap->generic3Reg->outputcap.

No EMI/AC filtering, cheap caps, generic diodes, etc...

Seems expensive for $40. The case adds to the cost...

Things to do:

1) Add some basic AC snubbing
2) Better smoothing cap
3) Better output cap (Tantalum instead of Electrolytic), maybe film bypass.

I am not sure that better diodes would make any difference...

For the $40, I could have bought much better components, put in a bud box and have a really good supply (even a Jung regulator)

Oh well...
I hope your DOG moves into your neighbors yard. (inside joke)

Dale

mma0604
2007-12-30, 22:27
I have an ELPAC WM050-1950 (5V version). How do I open this thing? I don't see any screws or anything? Thanks

singleended40
2008-01-02, 12:47
Some people suggest Hexfred 4A or 8A. Others prefer Schottky's diodes. I use Hexfred diodes the sound gets smoother (no edgy). Since Elpac does not have enough space for Electrolytic 20,000uF/63V (the best way to do is using 2x10,000mF/10V-20V- in this case) you need to get a small voltage caps like Nichicon.