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In Reply to: RE: Raspberry Pi/HiFi Berry encore! posted by Ivan303 on April 10, 2017 at 20:02:51
...these USB batteries are essentially switch mode power supplies.They typically take a nominal 3.7v Lithium battery and incorporate a boost converter chip (switching power supply circuit) to increase the battery voltage to 5VDC.
The one thing these USB batteries offer is isolation from the AC mains, but their DC output quality may or may not be any better than a wall wart switcher. In other words, you are not getting 'pure DC' off the battery itself but via the switching circuit.
Typical, but there are several such chips on the market
Edits: 04/11/17Follow Ups:
it works
Dynobots Audio - Music is the Bridge Between Heaven and Earth
depending on the wall wart it replaced.
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Dynobots Audio - Music is the Bridge Between Heaven and Earth
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I still find audible improvements using a battery source vs. an AC powered wall wart.
They don't take on the same level of "false brightness" that masks resolution in my experience.
I raised this question with the guy who makes Elijah Audio (he makes lots of usb cables that either block the dc power or let you add your own DC into the mix. And his response was "yes there are crappy regulators in those things, but its still better than the power coming from a computer."
I can use it on the $200 SMSL M8A (ES9028Q2M) 'DSD 512' DAC I just purchased on MassDrop.
DAC is for use in the office only, along with the EMO BasX A-100 that I just orderd.
No audiophiles allowed!
But it will give me a chance to play around with up-sampling to high sample rate DSD for the first time.
Doubt I'll be throwing away my multi-bit ladder DAC any time so but ya never know. :-)
With my previous Touch players, I used linears from Welborne Labs and Teradak. With those units, I found roughly equivalent sonic performance vs the battery supply - albeit with greater convenience.
Sounds a WHOLE lot better than the Wall Wart that came with it.
That said, a $60 LPS likely will beat it.
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