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Best 5V SMPS ?
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Old 6th February 2018, 02:26 AM   #81
SanjeevM is offline SanjeevM
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That is revealing, I thought they had 5V cell combos inside them.

Let me get 4 duracells and compare.
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Old 6th February 2018, 02:28 AM   #82
SanjeevM is offline SanjeevM
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But I wonder if RPi will take 6V...
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Old 6th February 2018, 02:33 AM   #83
SanjeevM is offline SanjeevM
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So,
linear supplies have diode noise,
SMPSs have switching noise,
Battery banks have boost convertors,
Duracell is 1.2V
Car battery is 12V, 2V x 6,

So where do I get clean & pure 5V dc from?
Best 5V SMPS ?Best 5V SMPS ?
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Old 6th February 2018, 11:13 AM   #84
SanjeevM is offline SanjeevM
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I found this article, which says that even batteries generate noise!! So much for using them in the hope of clean power!!

Power Supplies and Noise | Light Harmonic

He further states that linear PSs are the lowest noise ones. But what about the humming and buzzing from a trafo?
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Old 6th February 2018, 02:20 PM   #85
soundcheck is offline soundcheck  Germany
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All of them are compromises.

It's again a matter of design and implementation quality.

You get good linears, you get good SMPS, you get good battery supplies
and not to forget you get very good supercaps supplies.

You'll also find bad versions of all of them.

And then it's a matter of application. Different applications require different
power supplies.

All this has multiple dimensions.

And then you gotta combine many of them.

And. If you look at it from a wider angle. Your whole audio system is very complex.
Groundloops, cabling, etc. matters.

And of course your house environment also matters.

You've got a nice journey in front of you.

Good luck.

Last edited by soundcheck; 6th February 2018 at 02:23 PM.
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Old 6th February 2018, 11:44 PM   #86
SanjeevM is offline SanjeevM
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Yes, I understand the PS bit a little better now. There is no silver bullet here.

I also read about combo psu where the output from a switching convertor is regulated by a linear LDO regulator. It is claimed that a good amount of noise gets cleaned up.
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Old 8th February 2018, 08:21 PM   #87
chris14 is offline chris14
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Default iFi grounding adapter

Quote:
Originally Posted by SanjeevM View Post
Thanks, Chris, I will try to get one pair, and compare the IFI with the battery again.
iFi can supply this for ~$13 inc shipping in the US. Resistance to ground is ~ 15 Ohm.
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Old 9th February 2018, 06:38 AM   #88
CallMeMike is offline CallMeMike  United Kingdom
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... what about a much cheaper and easier to accomodate alternative: a dummy mains plug (EU/UK/AU/US/JP) where a non-descript wire is soldered to the 'earth' pin (the other end being connected/soldered to the 'negative' output of the PSU
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Old 9th February 2018, 07:12 AM   #89
soundcheck is offline soundcheck  Germany
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My idea would be to keep the ground impedance as low as possible.
And I'd also try to avoid creating new antennas. Obviously there's a catch.

All these el-cheapo plugs and connectors are IMO all but optimal.

I do have all my stuff (amp/dac/pi - all sitting side-by-side on one board) stargrounded via Wago terminals - without connecting them straight to earth.

Perhaps I try that ground-wire idea one day.


But before you start doing anything. Make yourself a drawing about the grounding-scheme of your entire system.
It's quite beneficial to have the full picture of what you've right in front of you on paper.

Last edited by soundcheck; 9th February 2018 at 07:28 AM.
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Old 14th February 2018, 04:39 AM   #90
SanjeevM is offline SanjeevM
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Quote:
Originally Posted by forestsgump View Post
It is rather interesting findings on Allo adapter, the IF I adapter, and a 10000mAh Battery bank from MI.

No doubt that AC power supply such as Allo, IFI comes with inherit noise. But pesonally, i always have doubt battery bank such as 10000mAh Battery bank from MI are noise-free; although they are from DC power supply, however 3.7~42v Li-battery undergo switching mode DC-DC to bring up to 5v USB power, such approach inherently cause switching noise output as well.
Perhaps, we have been looking at the picture only from the pov of from noise. To reproduce sound, especially bass, current is needed, i.e. a big store of electrons. It can be said that power amp needs it more than a dac, but Allo has been using SC on their DACs near the OP stage.

Maybe a battery provides electrons better than psus so sounds richer !

Just my 2cents ...
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