With my PC speakers going out on me, and since I have lots of speakers lying around, I bought an inexpensive car amp and hooked it up to 12 volts via a Molex connector in the PC case, but I get a ...

I'm trying to figure out a way to deal with a ground loop problem I have at home, this is 60hz mains hum that comes out of speakers, even when nothing is connected to the device besides power cable. I ...