Can I power my 9v amplifier using usb?
I made a small amplifier in a design class once and it requires a 9v battery to run. I want to use it to make some LED's flash in time with music and so I would like to run the amp off usb. I thought about using a transformer or dc converter but I'm not sure whether it will give enough current to run. Could I just run it straight off usb or will the 5v not be able to powere it? I have a multimeter so if needed I could possibly use it to find out the rquired voltage and current? Please reply if you can help me with what to do. Thanks