Holy, thread resurrection Batman!Originally Posted by GreenBeast
Seriously, I don't see how this helps. What causes thump? Is it the audio signal showing up and disappearing with a powered on amp? If that's the case the rule should be always power on the amp after the pc and shut it down before the pc:
PC On, Amp On.
Amp off, PC off.
So with your circuit, the ignition wire goes dead, the relay opens, the amp turns off. The PC turns off a little while later (mine does standby after 5 seconds). Is this right?