We all use them.  Those plastic blocks with a barrel connector that you plug into the wall that convert the high voltage AC power from your outlet into smaller AC or more commonly DC voltage for your electronics.  We also LOSE them all the time, or they get damaged or just stop working.  In this video Dave explains how to find the right power supply for your device.

A common problem with the popular MicroKORG synthesizer is power switch failure.  In this video Dave explains how to replace it.

So, hey... We want to shoot in this really cool looking bar, but there are big mirrors on three walls and on the ceiling, noisy coolers we can't shut off, and we're going to be cross shooting with two cameras that will be panning and tilting with the talent movement.  We don't want to see you, your boom, or any shadows in either frame and we want usable sound.  You can do that right?  No problem.