Thought not. I have one, but I'd quite like the thing it's plugged into (amp) to be able to power it. There are probably hundreds of good reasons not to do this.
Does your amp not have a usb socket? Take power from that. Then use the 3.5mm line out (or even the mini optical inside it, if your amp has an optical digital-in) to take sound into the amp.
Thought not. I have one, but I'd quite like the thing it's plugged into (amp) to be able to power it. There are probably hundreds of good reasons not to do this.