I have a car radio I'd like to set up in the garage, powering 4
speakers from it. To power it I thought about a PC PSU as they
have 12 volt output and can supply 10 amps.
1. I understand that they need some altering to 'wake up' the
main power supply, so does this mean that the PSU would be unable
to supply a low-current 12 volt supply to the accessory supply to
maintain radio tuner memory, etc?
2. How much power do these PSUs draw when they are supplying
nothing to whatever they are connected? Being a switched mode
unit, I understand that they have a constant draw of power.
My understandings, of course, may be wrong.
Last idea is to run the car stereo from a small lead acid battery
(which I already have, so no cost involved) and to connect a
small trickle charger to the battery to keep it topped up. Any
comments on this idea?
Thanks very much for any helpful info you can give me.