Some progress, and a Q?
The circuit is coming together nicely. Yo_Duh and I resolved some last minute issues.
I had a difficulty with the power up sequence, but with a set of AND and OR gates, I can route a "Power Good" signal to the mobo, if no less than 2 PSUs are on. The signal is TTL compatible.
The mobo supplies 4 mA to the PWR ON line of the PSU, to turn it on, so it'll have to put out 12 mA, to power up all three.
What I'm not sure how to deal with, is the +5V Stand-By line.
Q: how much power does a mobo need from the +5 Vsb line?
...and how do I route enough power to it, not knowing which PSU will be available?
The PSU is rated for MAX 1.0 amp on the +5 Vsb line, so I assume that the mobo requirement is quite low, but what's it for?
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