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Have just got into this squeezebox thing. Damn these things rock! (with a dac)
I can see the day when I shall soon be shelving my $2000 tubed/modded cd player.
Question is this my walwart switching psu actually sounds better than my new linear psu, the linear supply is NEW so it has yet to break in.
Question is this>
If I leave the linear psu plugged into the mains it generates some heat, does this mean that it will actually "break in" this way or do I have to have it plugged into the squeezebox for it to break in?
(I'm not tripping about the wart sounding better (at the moment.) I have a 55w push pull set amplifier (pictured above)running a pair of magnepans, squeezebox feeding a v-dac through audioquest ic's, autoformers, goertz cables etc)
Follow Ups:
For what it's worth, I didn't notice any difference when I tried a linear supply in place of the switcher.
About the only thing I can imagine "breaking in" in a power supply is the output capacitors forming a bit further and that will happen just fine if it's only plugged in.
Perhaps the change that some folks notice from swapping power supplies is actually due to a susceptibility of some other piece of gear in their system to the line hash from the switcher and your stuff may simply have better line rejection. Who knows? Trust your ears. If it doesn't matter in your system or sounds worse, well, you know what to do.
Rick
Thats what I've been saying all along. The SB switcher sprays a large amount of junk both into the air and back into the mains (I've measured it many times). The primary use of the linear supply is to cut down on all that junk being sent out into the environment.
The other thing is that linear supplies are not all the same, some spew out almost as much crud as the switcher, although a different spectrum.
The best bet is to build one of the supplies I posted here a while back, they are specifically designed to spew out a very small amount of crud.
John S.
Hey John,
I've trolled through your posts but can't find one of your psu designs.
Would you please post me a link(s)
Here is the post, see the whole thread. Let me know what model squeezebox you have and I can come up with a tailored version.If you go with the 9V version I found out that the R3 and R4 resistors are backwards in the schematic.
If you have a classic, use fixed 5V reg not the adjustable one. In that case the gnd pin of the reg goes to GND.
Carefully check the datasheet for the reg, the pins on the actual package are not the same order as shown in the schematic. (match the pin name in the schematic with the pin name in the datasheet)
Thanks,
John S.
Edits: 07/26/09
John,
Would the 5 volt version benefit the EMU 0404 USB sound card?
Thanks,
Tim
Yes it does make a significant improvement in the 0404USB.
John S.
JS,
Cool, this is going to be my next mod (if I can locate all of the parts) in my networked audio journey. I look forward to hearing the difference between this and the wallwart.
Sincerely,
Tim
I don't see an "R4" in the schematic. Did you mean R2 and R3 are backwards?
Bill's Audio Cave
Yes, its R2 and R3 that are backwards. What is it about these resistors, I get them backwards and then can't call them by the right name, it must be the resistor curse. (most likely just getting old and the brain is going out the window) This gives me pause pause about the 700V PS I'm rebuilding right now. I better make SURE I have the 700V and the 160V going to the right places!!!
John S.
I have the same affliction! And knowing the resistors were reversed is of course the reason that my copy of your PSU is sitting unfinished on the bench for two months. Now I know why, I gotta reverse R2 and R3 LOL.
Bill's Audio Cave
I'm going to have to suspend judgment for a few days until I can do a proper a-b comparison.
But I think your hypothesis may be spot on, and I suspect this because Im using one of these, RGPC 400's.
Hmmm?
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