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Off-The-Shelf Linear PS for Pi?
Off-The-Shelf Linear PS for Pi?
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Old 5th February 2018, 03:53 AM   #21
Wayne1 is offline Wayne1  United States
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Off-The-Shelf Linear PS for Pi?
The John Swenson designed JS-2 should meet your requirments

Uptone Audio JS-2

As a DIY alternative, look at PI mezzanine PS. This will require an outboard transformer.
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Old 5th February 2018, 09:42 AM   #22
scottjoplin is offline scottjoplin  Wales
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$925 for the Uptone PSU, if I didn't know better I'd think advantage was being taken of people's fear and ignorance
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Old 5th February 2018, 10:32 AM   #23
PJN is offline PJN  United States
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There are lots of cheap Chinese linear psu's on eBay. I used a couple of adjustable ones on a past dac project and they worked out great. You can get them preassembled, just need to get a suitable transformer. It is a relatively cheap experiment, worst case you would be out 40 bucks or so.
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Old 5th February 2018, 11:48 AM   #24
fb2017 is offline fb2017
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I really doubt you would be able to hear any difference, with any I2S DAC currently on sale. What DAC do you want to use? I2S or USB ?
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Old 5th February 2018, 12:34 PM   #25
BillTheCat is offline BillTheCat
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Quote:
Originally Posted by scottjoplin View Post
$925 for the Uptone PSU, if I didn't know better I'd think advantage was being taken of people's fear and ignorance
Quote:
Originally Posted by fbbf View Post
I really doubt you would be able to hear any difference, with any I2S DAC currently on sale. What DAC do you want to use? I2S or USB ?
That's a really good point.

Since I'm not as deeply into this as you guys are, I look to this community for advice. What seems to happen all too frequently, however, is that questions like mine tend to draw snarky and otherwise useless replies when all we're looking for is some usable information.

Anyway, I think this question has run its course. Thanks for your input!
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Old 5th February 2018, 01:23 PM   #26
oohms is offline oohms  Australia
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The raspberry pi has protection circuitry on the incoming 5v to make it more idiot proof. In several applications i've had to apply power directly to the 5v connection on the 40 pin header to bypass this. Any 5V 2A linear supply should handle it alright
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Old 5th February 2018, 01:43 PM   #27
BillTheCat is offline BillTheCat
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Quote:
Originally Posted by oohms View Post
The raspberry pi has protection circuitry on the incoming 5v to make it more idiot proof. In several applications i've had to apply power directly to the 5v connection on the 40 pin header to bypass this. Any 5V 2A linear supply should handle it alright
Well, idiot-proof is definitely what I need.

I'm not comfortable with unsoldering the pins, I'd rather connect using the USB plug spliced to an AC adapter.

My earlier question got lost in the sauce.

Do you think one of the Meanwell RS-15-5 units would be enough to power both the Pi and DAC separately, or would I need two? I can de-couple the DAC power from the Pi on the HiFiBerry by removing the resistor (jumper) at R14 and they now provide a separate 2-pin power input on the board. I would think it'd be fine since the Meanwell can power the Pi/DAC together via the USB. Just wondering if I'd be running any risks.

Thanks!
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Old 6th February 2018, 06:43 AM   #28
fb2017 is offline fb2017
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Well, why don't you try it with the standard power supply first ? (If you plan on using the I2S addon boards, of course). I am using an IQAudIODAC, and it really sounds very good. I really don't think it will improve by using linear power supplies, etc..
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Old 12th February 2018, 01:07 AM   #29
exponent is offline exponent
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I think I know what your issue is. Typically a raspberry Pi will draw in the neighbourhood of 500mA. The only reason I can think of that separate power supplies would affect the DAC is if the Pi cant deliver enough current out the USB port. I am assuming your are using USB? RPI can only deliver a max of 500 out the USB port. Check your DAC to see what it requires. 5V power supplies are dirt cheap. But before buying two add up your current needs and go from there. If your DAC needs less than 500mA then you are fine.
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