Does the USB port power third party peripherals?

I wish to use the airport express to stream (airplay) music to a hi-fi system.

In order to connect the airport express (digital optical out) to the amp (analogue RCA phono) I will need to use a digital to analogue converter.

The majority of these are mains powered but I am looking at a USB powered one and I need to know if the USB port on the airport express will be able to power a digital to analogue converter as it appears its main function is to connect to a printer.

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