Many modern usb audio interfaces (basically these are external soundcards) are designed to be connected directly to a PC or a laptop for both data and power.
Now, I have an Edirol ua-4FX which I'd like to use with a few 9v batteries or an usb battery pack - without the need for a laptop or a pc.
I tried to connect an usb battery pack with a fitting modified plug (usb type B) and I get no power into the Edirol ua-4FX - I've connected all the 4 wires accordingly...
Then, on reflection, I've noticed than none of the usb battery packs have a type B usb connector - is this a clue that it's basically impossible to feed this type of units unless one uses a computer or similar?
It's a real pity...something so close seems to be unreachable for some design oddities
Or are we just been presented with another clever gimmick to create more useless demands and therefore products? So one has to buy that unit for a computer and another similar to use with batteries?
Now, I have an Edirol ua-4FX which I'd like to use with a few 9v batteries or an usb battery pack - without the need for a laptop or a pc.
I tried to connect an usb battery pack with a fitting modified plug (usb type B) and I get no power into the Edirol ua-4FX - I've connected all the 4 wires accordingly...
Then, on reflection, I've noticed than none of the usb battery packs have a type B usb connector - is this a clue that it's basically impossible to feed this type of units unless one uses a computer or similar?
It's a real pity...something so close seems to be unreachable for some design oddities
Or are we just been presented with another clever gimmick to create more useless demands and therefore products? So one has to buy that unit for a computer and another similar to use with batteries?