I want to be able to control "n" number of DC power circuits with "n" number of 5V circuits. I also want to be able to use full PWM control, not simply turning the power fully on/off binarilly. I was wondering if anyone knows of a commercially available board with 8 or more mosfets ganged. These seem to be easy to find for relays, but not mosfets, for some of reason. The most mosfets I can find on a board is 4. I would also very much prefer a properly designed board with 4 corner mounting holes, not just two on one side. (Why would anybody do that? Those boards with only 2 corner mount holes can be jerked up by wiring like a hang nail and don't even lie flat by themselves because of the bottom of the board balancing on the soldered through hole leads!)
I am looking for something along this general form factor, but with MOSFETs.
Machine control systems tend to run on 24V. It's low enough to be safe but high enough to keep the wire gauge down. 18 ga works well for most applications. Your interconnects are going to be the issue. Locking connectors are best for retention but they tend to be bulky & heavy - not the best for robotics use.
If you crimp pins, only use the ratcheting type (not the free hand "squeeze with all your might and hope" kind)
Ideally input cables and output cables are separate. All the inputs are typically switched to ground so input cables have a black (ground) runner. Conversely outputs are usually active low so the devices are fed a hot and have low side switching. Thus output cables have a +V (red) runner.
Signal, schematic, and cable markings flow from inputs on on the left to outputs on the right. The cable tags (ALL cables are tagged - BOTH ENDS) should read correctly when the cables are oriented inputs left, outputs right.
Inputs are pins, outputs are sockets.
What power requirements do you need? Is the 2A device you linked adequate for 12V with your motors? If your motors works 2A at 12V, do you need 1A at 24V or 2A at 24V?