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In Reply to: RE: Warming up system posted by E-Stat on April 23, 2017 at 09:00:48
The LPS-1 just gets it right. :)Thanks for your report. I'm now using three LPS-1s in a "no mains power" digital setup; my experience is much the same as yours.
AbeCollins wrote:
. . . if there was a way to know how long the device being powered is on capacitor "bank A" before it switches to "bank "B"Other than monitoring the power drawn by the PS driving the LPS-1, the user don't know if the LPS-1 is charging or idling. As I understand it, cycle times are short, a matter of minutes, under a minute near maximum load.
Charging currents certainly increase as the power draw from the LPS-1 increases. Plug the PS into one of those power meter things and you can see the power draw go up and down quite rapidly even though the load is more or less constant and well within limits. I use an LPS-1 to drive an embedded PC that draws ~700mAmp (+/- a few mAmps only) at 7.5v. The power drawn by the PS fluctuates every few seconds between a low, a middle and a higher value though I forget now what the values are. (In any case, settling time for a cheap power meter is probably too long for readings to mean much other than that they do fluctuate.)
I've tried different PSUs to see if they affect the sound quality of the device being driven by the LPS-1. My "trials" were certainly not exhaustive but my experience was that PS quality made no difference provided the mains supply to the PS was adequately filtered. If I'm right, any perceived degradation is presumably down to the PS feeding noise back into the mains, not because one supply's output is "cleaner" than another. The answer was simple: I used the filter/isolating transformer that I'd prior used for the PC's linear PSU to drive the LPS-1's PS. That done, I cannot tell the difference between Uptone's stock SMPS and a couple of reasonably decent linear PSUs.
Another tweak is to filter the LPS-1's output. Fitting Mad Scientist Audio "kegs" to the two lines makes for a worthwhile improvement (as it does BTW with those battery "chargers"). Again, I assume it's down to noise from the driven device. I've been meaning to try a little C-L-C filter, mainly because it'd be much cheaper than MSA "kegs", but I've yet to do so.
My experience is that devices powered by an LPS-1 typically sound significantly better than they do when powered by a battery charger though the difference is more marked with some devices than others. (A WaveIO USB>I2S board e.g. = big difference, the Intona thingie, much less.) That said, the charger cost about a tenth as much as the LPS-1 and, even though they work at 5v only, can safely be recommended.
Though making the adapter was fiddly, I fitted an Anker 22100aH charger to a friend's M2Tech HiFace, one of those tiny DACs that connects straight into a USB port. He's delighted with the improvement.
Edits: 04/24/17 04/24/17Follow Ups:
Alex at UpTone here:
Thanks for your nice reports. And your facts are all about right.
The LPS-1 does switch banks rather often--indeed based on load. If you want to see just how often, there are two sets of red/green LEDs on the board (one set in the corner, the other near the middle). The case takes a Torx T10 (remove only one cover plate and slide the board out), but please don't touch parts while it is operating.
I don't hang our here at AA these days--just too busy with product production and launches to keep up with more than one or two forums--so I invite any/everyone to stop in at our sponsored forum at ComputerAudiophile:
https://www.computeraudiophile.com/forums/forum/25-uptone-audio-sponsored/
John Swenson and I are always happy to give honest answers to any questions over there.
Best regards.
AJC
a new DC power cord for the unit!
John Swenson has found great results using star quad Canare cable over at CA. I purchased some along with the screw terminal connectors he uses as well.
Total cost-about six bucks for 8' of cable and ten connectors!
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