Frequency Central MicroBus PCB Help

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I’m seeing an average with my modules of about 35 mA (total on +12 and -12 V rails). Of course yours will probably differ, but using that, 12 modules per row comes to 420 mA. Add whatever your Eurorack demands from 5 V, if anything. The Microbus is rated to deliver ~500 mA (per rail, I think, which would be 1000 mA total), so one per row should be well within spec.

But that’s 4 times 420 mA or 1680 mA delivered to the modules, in terms of power about 20 VA. That’s well beyond your 1000 mA wall wart. And in fact FC recommends a 1000 mA wall wart to power one MicroBus. If each row’s pulling 420 mA, well under what the MicroBus is rated for, really that wall wart could probably power two PSUs, but not four. You can shop for a 2000 mA wall wart, but it might be easier just to use two 1000 mA or 1500 mA ones, two rows for each.

As for how:

Power supplies choices?

Assuming one AC wall wart and two FC power supplies, and that your wart has enough amps to power both supplies, you can connect them in parallel: same wire from the wart to AC1 on both supplies, the other to AC2 on both supplies. EDIT: See this picture. If you mix things up, you’ll short the supplies (see this post for why).