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In Reply to: RE: Do you remember who opined that? posted by triodesteve on May 26, 2017 at 12:56:07
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.
Follow Ups:
The Anker showed up today. You are right. It sounds good.
I believe there is a way to power an Rpi (if you are using a hat) directly from the hat..bypassing the internal regulator of the Pi....I think
My Ankers sound much better than my Easy Accs
No idea why but I found the same. When I first tried an EasyAcc as a replacement PS for various devices, I quickly reverted to the linear PS but, when I later tried an Anker PowerCore 20100, I found that it sounds significantly better than even a decent C-L-C linear PS.
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.
I'm not sure what you mean by "the regulator in a pre-DC stage" but I am sure that it's nonsense to dismiss (yet again) a device you haven't tried or, I suspect, even seen.
I haven't tried the LPS-1 or the Anker on a RPi but I have compared them on several other devices, inc clocking and supposedly PS-immune isolation circuits. If there's one thing here that I am sure of, it's that there really is no comparasion between the two. It's fair to argue that the LPS-1 is too expensive for you to justify its use in your system but, honestly, if your RPi boxes don't sound better when driven by one rather than the likes of an Anker charger, something is amiss.
If you're concerned about HF interference put a ferrite bead on the DC line and keep the cable short.
Better than nothing I suppose but it's neither hard nor expensive to improve on that. See e.g. recent discussions of quad-core cables.
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.
I'm questioning [the LPS-1] as a technical solution. Therefore there's IMO no need to even try it.
There being no logical defence against solipsism, I'll not try to provide one.
That just leads to "overregulation" of the whole chain. It just slows things down.
If, as here, the OP impedance of the first device in the chain is lower than that of subsequent devices by an order of magnitude or more, your argument fails. Think about it.
Basically that's the way I'm running my supplies - after trying all kind of stuff over the years.
Absent detail, argument from authority doesn't impress. I stand to be corrected but, for all your undoubted expertise, you don't seem to grasp how a supercap device works or why they're unlike older PS designs.
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