[helloheadset]

Hi, i want to make a psu for a usb dac.
Has anyone made an USB PSU before?
Does anyone know how to make one?
 
Thinking of one like this http://teddypardo.com/Products/Power%20Supplies/TeddyUSB.html
or http://www.aqvox.de/usb-power_en.html
 
Could you just use a standard AC/DC 5v 1A transformer for the latter one?
Thanks

 

[alamakazam]

a simple lm7805 will do the job

 

[helloheadset]

Thanks.
How do i use one?
 
Im not experienced.

 

[alamakazam]

an example
 

 

[TheLaw]

Ehh don't waste your time. I don't think. The ripple on the 5V rail of your computer can easy be dampened with some high value capacitors.You could also use a filter network to get rid of the junk on the rail if it really concerns you.
 
If you are still convinced, It's as simple as an LM7805 or equivalent