I'd like to use the +12 and -12 leads from an old PC power supply to power 24v irrigation solenoid valves. The values are rated 0.22A inrush current and 0.1A holding current.
I only plan on 1 or 2 solenoids being energized at a time. I can arrange for them not to be initially energized at the same time.
I see from some wikedpedia info on PC power supplies that the -12 is only rated for "minimal" current. But what is a typical -12 max current value for some random old PC supply?
Q: Would a 1A max load be a problem?
Bonus Qs: Any problem using the +12 and -12 leads for 24 V potential? I'll be controlling the solenoids through a relay. For the solenoid loads, should I use diodes across the solenoids?