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I was thinking to power my Stello U3 with a double headed usb cable connecting the 5v cable to an usb battery charger.
It should be a better/clean power compared to the 5v coming from the pc usb port.
Any experience?
Thom
Follow Ups:
Hello,
this is cheap and it works ok in my system (a not very resolving one).
It is cheap and maybe you will like it as well.
Batteries are just so inconvenient ...
Kind regards,
bg
Another interesting solution could be the John Kenny Usb to Spdif converter using a battery to operate:
https://sites.google.com/site/jkciunas/
It seems a good solution, thank you for your advice.
Thom
Hello, you were speaking of something cheap
I am sure something much better and more expensive do exist
I would have bought the adaptor cable only if possible.
A good 5V/1A linear PS should be enough ...
But without the cable it is problematic
Kind regards,
bg
let me know what the chip used (on heatsink) is?
Hello Mr. Fmak !
on the same heath-sink on one side there is a LT1085 and on the other a NPN, marked E44H11 (Fairchild part i guess from the F logo).
If i am not wrong the LT1085 is a good part.
I do not like the grey lytics ... i see that the picture on ebay shows different caps that look higher quality. Arrghhh ....
i like Panasonic 105 C series.
But i do not have a solder pump at hand ... i would replace them all.
Overall the unit looks quite well built.
Kind regards,
bg
Edits: 03/09/14
I have bought one to use as a neater preregulator. There may be room for a superregulator fed from the 8.5V rail. The LT is not particularly low noise. The transistor you mentioned may be a series pass regulator for the 5V rail. I am not happy though the price in China Taobao is only RMB285 +10 postage ie half $90.
Don't rush to replace the caps unless you measure DA at 1kHz and 10kHz first and find it high. Look may be misleading.
Panasonic FC and other 'audio' caps I have do not have low DAs like Rubycons; in fact they are rather high. For whatever reason, a 1 uF Polypropylene film as a bypass at the caps can work wonders despite all the stuff written about this being 'useless' unless xxxxxxxxxxxxxxxxx.....
Hello and thanks for the valuable advice
Have you tried it alone for usb power duty ?
Unfortunately i do not have a scope at hand to check the actual noise coming out of it.
Besides, which specific Rubycon series are you referring at ?
Thanks a lot again.
Kind regards,
bg
I have not got it yet and will not until I travel to collect.
Rubycon PK. The cap won't affect measured noise level much.
Thanks again. As i said the caps in the picture seem better quality
But for the price it is a nice little unit indeed.
Kind regards,
bg
Hi !
i am visiting parents now. I will do it asap when i will get back home.
I have opened it and read the part code.
I guess a normal 5V/1A fixed voltage regulator. Anyway i will check.
In my opinion the more important piece is the cable depicted.
I would have bought just that if available.
It looks quite nicely made.
Moreover a usb dac that relies on usb power supply from the PC to function
is a little weird.
I like on principle the idea of a isolation of the dac from the pc power supply.
Kind regards,
bg
Edits: 03/08/14 03/08/14
I have designed SLA and LI battery, linear and SMPS supplies for USB interfaces. I have sold all of them. I have a LOT of experience with all of these.
The worst of these is the battery, even LI with ultracapacitors in parallel. LIFEPO is not bad however.
The next best is a high-efficiency V-rated SMPS
The best by far IME is a fast-reacting low-noise linear supply like the Hynes that I make. Lesser linears need not apply.
The issue with digital is that it is a load with fast di/dt, so you need a fast-reacting regulator in the supply.
Steve N.
I know that a linear PSU will be better, but I think the price to pay is too high compared to the Stello U3.
I'm only looking for a cheap alternative to the usb port power supply.
Thom
If you want to have the next level of SQ, cheap is no good. You can make a superegulator supply for $100 which they would charge $500 for, at least.
don't have clean output. Look to a 5V superegulators such as those by DEXA at feed it with 8-9V preregulated suppy.
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