Rpi PS: Not what I expected
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| Posted on May 26, 2017 at 10:06:13 | ||
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Posts: 803
Location: Walla Walla Washington Joined: September 4, 2001 |
The Teradak U9 linear ps finally arrived. Using the usb out (5v @ 800ma) I was underwhelmed. I know this is a bit underpowered (the specs call for 2.1 ah I think) but I don't have anything plugged into the Rpi other than the dac. The Rpi does not power the dac and even the 5v signal comes from a battery (via split usb) Anyway, the Teradak sounds too hifi and a tad mechanical. I prefer the apple iPad 10w power supply. Who would of thunk it? I do remember someone doing some research and coming to the conclusion that the Rpi sounded best with a switching ps. I think I'll try an iFi next.
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| Do you remember who opined that?, posted on May 26, 2017 at 10:30:11 | |
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Posts: 37653
Joined: May 12, 2000 Contributor Since: April 5, 2002 |
I do remember someone doing some research and coming to the conclusion that the Rpi sounded best with a switching ps. Such is contrary to my experience with either the SB Touch or RPi. Or any audio component for that matter. As for Teradak, this is the one I used for a while. A bit more than $44 though. :) edit: As a point of reference, I have two lipstick sized batteries with 1A capability. You might try spending ten bucks on one of those.
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| RE: Rpi PS: Not what I expected, posted on May 28, 2017 at 08:09:51 | |
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Posts: 13158
Location: Kent Joined: June 1, 2002 |
The Teradak is a rather basic PS and you shouldn't expect much from it.
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| RE: Rpi PS: Not what I expected, posted on May 28, 2017 at 08:14:26 | |
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Posts: 803
Location: Walla Walla Washington Joined: September 4, 2001 |
It shouldn't sound bette than an Apple 10w iPad charger?
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| RE: Do you remember who opined that?, posted on May 29, 2017 at 00:01:59 | |
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Posts: 2426
Joined: July 11, 2007 |
There are also differences between batteries! Some sound like crap others do quite well. E.g. My Ankers sound much better than my Easy Accs. Bottom line. You can't just talk about "Batteries" in general. For sure these devices will kill your ground loops. It's again about compromises and tradeoffs. And then the regulator in a pre-DC stage is IMO of minor concern first of all. That's why I e.g. consider an LPS-1 nonsense. If you're concerned about HF interference put a ferrite bead on the DC line and keep the cable short. And again. My iFi iPower is better than any battery I had around. But the battery was better then several linear supplies I had in my hand. Enjoy. ----------------------------------------------------------------- blog latest >> The Audio Streaming Series - tuning kit pCP
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| RE: Do you remember who opined that?, posted on May 29, 2017 at 06:52:29 | |
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Posts: 2426
Joined: July 11, 2007 |
I'm actually not questioning the LPS-1 as a product (not in this post ;) ) , I'm questioning it as a technical solution. Therefore there's IMO no need to even try it. I'm questioning highest quality regulation in the first stage - and that's where e.g. an LPS-1 gets used - of a potentially 2 to 3-stage supply chain. That just leads to "overregulation" of the whole chain. It just slows things down. The probably much better approach would be to offer just the supercap buffer on the output - maybe as an option - the way a battery would be used. Basically that's the way I'm running my supplies - after trying all kind of stuff over the years. Enjoy. ----------------------------------------------------------------- blog latest >> The Audio Streaming Series - tuning kit pCP
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| RE: Rpi PS: Not what I expected, posted on May 29, 2017 at 07:07:19 | |
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Posts: 13158
Location: Kent Joined: June 1, 2002 |
It's how your system interacts with it. A better PS can reveal gremlins elsewhere.
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