I recently got this cheap USB dac thats plugged into my pc over USB - B but it still needs Micro USB power for some reason. So I thought I could just connect the 5V from the USB A port to the Micro usb's. Is there any reason why this doesn't work?
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The specified currents are:
Since most USB hubs in PCs are USB 3, you can guess that they can push 900 mA regardless. Also, PCs are using internal USB hubs nowadays and often they don't regulate a single USB outlet but the cumulated power the hub is pushing. This isn't necessarily safe, but this makes a couple of hubs capable of pushing 1000mA or even more on a single outlet, even though it is not specified this way.
All in all: You could be fine by doing this, depending on the overall power draw of your device. But probably working on a USB 3 port.
thanks