I'm setting up wireless in my car, which requires several 5V devices. Several of the devices are USB-bus powered. I will have to run two 2A DC-DC converters (unless someone knows where I can get one that delivers around 4A....all the ones I've seen are 2A or less).
anyway, I was going to run my 12V devices (the bluetooth adaptor) and my 5V adaptor, connected to the PDA and hard drive, on the same circuit, and running to the same ground, which is on the stereo.
I know that grounding audio devices to the same ground as the stereo is a MUST to prevent noise, but will running a 5V adaptor on that same circuit cause problems?
the way I see it, the 5V devices will ground to the 5V adaptor, which will, in turn ground to the radio ground. Will this cause noise?