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Howto Raspberry Pi power Supply
#1
Following Larry Moore's comments on separate power supplies for the Raspberry Pi and Allo Boss dac, I agree that a switching supply is fine for the Pi and a nice, low-noise linear supply is best for the dac. The point I would stress is that the switching mode supply for the Pi needs to be rather larger than the ones that are typically available and used, I recommend at least three amps at five volts (some suggest 5.1 or even 5.2 volts, the spec is 4.4 to 5.25). If anything is connected to the USB ports that consumes power, then preferably four plus amps. Most people are using supplies of two or two-and-a-half maps, which will just barely run the Pi and choke on surge loads. Beefier power supplies will shine when dealing with surge loads and cpu intensive loads like compiling moOde. YMMV, but I think that investing in a larger, better-built switching mode power supply rather than using those crummy, dime-a-dozen wall-wort usb supplies will improve all-around Pi performance; your Pi's power consumption is highly variable and adequate, clean power is, after all, the lifeblood of your Pi.

Best,

    John
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#2
(09-09-2018, 07:10 PM)Listener Wrote: ... YMMV, but I think that investing in a larger, better-built switching mode power supply rather than using those crummy, dime-a-dozen wall-wort usb supplies will improve all-around Pi performance; your Pi's power consumption is highly variable and adequate, clean power is, after all, the lifeblood of your Pi.

Best,

    John

+1
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#3
(09-09-2018, 10:31 PM)TheOldPresbyope Wrote:
(09-09-2018, 07:10 PM)Listener Wrote: ... YMMV, but I think that investing in a larger, better-built switching mode power supply rather than using those crummy, dime-a-dozen wall-wort usb supplies will improve all-around Pi performance; your Pi's power consumption is highly variable and adequate, clean power is, after all, the lifeblood of your Pi.

Best,

    John

+1

+2. I went with a regulated linear supply.  I'm sure either are fine. This minor effort definitely yields great improvements!
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#4
(09-10-2018, 12:22 PM)TracyZ Wrote: +2. I went with a regulated linear supply.  I'm sure either are fine. This minor effort definitely yields great improvements!

I think that is fine. I do think that separate supplies are a good idea; linear supplies for both or SMP for the Pi and linear for the dac as long as there is enough spare capacity for the Pi. Larry suggests improvements from feeding power through the GPIO pins, which I have yet to try.

    John
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#5
+1 
Good quality PSU is important for music systems. People are very often surprised how much the systems could sound with quality PSU

I using LPSU for my RaspDAC. It feeds the I-Sabre DAC board and RPi is feed through the GPIO.

RaspDAC on the right. LPSU for it is the black one on the left. The smaller one on top is the LPSU for my TT

[Image: Qk7NUc.jpg]
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#6
Can someone please help me understand why a battery isn't a better option especially for the low cost? Seems to me that a battery will add absolutely no noise. Thanks.

Energyi
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#7
You're right, it's actually the perfect PS, no ripple, no noise….
Only problem is, you need a battery that gives you a constant power, and not that the voltage drops over time. It should give you exactly 5V (or whatever voltage you need) with the needed current, and keep it at 5V for as long as possible, still giving you the necessary current….
A decent battery (like the Anker power bank family) also costs money...

J
I swear your honor, I have no idea where that knife came from....
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