Hello all

I will be purchasing a DAC/Amp (iFi Zen DAC) very soon, but it doesn't come with a power supply...It relies on an USB port
How would you design a "hifi" grade 5V / 3A power supply?

Thanks

 

Plenty of the Wall-Wart style 5v SMPS supplies.
Fairly cheap.
Max.

 

Any link (Amazon ideally)?

 

USB ports cannot supply 3A. A power supply having the same connector might do so, but that is on the high side.

Can you Linkk to the product so that we can see what is really needed?

Bob

 

https://ifi-audio.com/products/zen-dac/
I thought switching mode power supply were not great for audio application (noise?)
But anyway, it doesn't seem to require 3A......With1,5W from the specs, it means 0.3A

Thanks

 

Any link (Amazon ideally)?

For one
JOVNO 5V 4A Power Supply 20W 5Volt 4amp 3.5A 3A Power Adapter 100-240V AC to DC Converter Transformer LED Driver with 5.5x2.5mm Plug
Max.

 

It has a 5 volt DC connector on the rear. Allow some headroom with the supply. As far a switch mode power supplies if it were USB powered it would likely be from a SMPS. I would just look for a suitable SMPS and if you hear noise just better filter it. That or look for a linear supply but I see no need.

Ron

 

Well, the digital signal will come from a phone or tablet thru an OTG USB cable......Can a phone or tablet provide 0.3A (specs says 1.5W thru USB port)
Otherwise, you can feed thru a 5V power supply, but the specs doesn't say how much amp for the 5V rear panel jack...
How should I filter a SMPS output?

 

How should I filter a SMPS output?

I would not filter it unless a need arose like you can hear issues, like a whine, in the output. Then worry about filtering by maybe adding a few caps across the Power Supply output. The odds are you won't need to add any filtering.

Ron