At 12:27 AM 5/23/99 -0700, you wrote:
>Do you have any problems with ignition or other noise on the power supply?
>
>>
>> It's a DC-DC converter I made myself. Nominal 12 volts in. +5, +12, and -12

No, it's dead quiet through the stereo. There was a little RF coming from
the power input and audio output cables, but it wasn't power supply
frequency, it was from the motherboard. I threaded the two cables each
through fat ferrite beads and that cleared up the (minor)FM interference.
That kind of stuff is to be expected using a computer.

The car stereo had an aux input, and it has balanced inputs, so there were
no ground loops to speak of.

Cheers,
Bob