I’m dabbling in synth modules, largely influenced by Eurorack design principles but not keeping to their form factor. Where I am right now is PCB-mount pots and jacks on boards fit into 3-D printed cases with 2mm-pitch 4-conductor power connectors (sliding all over my testbench).
In order to make the synth workbench more space-efficient (and to save on crimping my own power cables) I am considering a simple backplane model where the modules would have card-edge connections and get mounted vertically, with side-adjust/right-angle “UI” parts. A slotted enclosure would provide physical stability.
For most modules, the only connections are for power (+/- 12V, +5, GND, the signals are routed over user-facing patch cables) but others might make use of esge-connected bus lines (for example a vocoder has multiple channels sharing carrier and modulation lines). Capacity for 20 connections would probably be overkill but better to leave room for future ideas, so 2/2.54mm pitch would be fine. Since it’s analog synth, high-speed and RF issues don’t enter into consideration for the large part.
Let’s assume I’m good enough to lay out the Edge.Cuts so my fab house can implement what I intend.
Two questions: How do I pick the connector? A first pass at DigiKey show up a couple of reasonable-looking choices like this: https://s3.amazonaws.com/catalogspreads-pdf/PAGE50-51%20.100%20LP%20DS%20EYE%20RA.pdf. Do I pick a few that look close and evaluate some prototypes? (I can budget for throwing some away.) Is this enough of a solved problem that I can get most of the way to done by following some simple design principles?
Secondly, are there any pitfalls I should look out for when designing the connectors? Do I want a special finish?
“Thanks for any insight you can provide.”