InterconnectEach og2 PCB has a right-angle 2x13 header which plugs into a connector. I built four "backpane" PCB's which contain the connectors that the modules plug into, connectors for power distribution, and traces to distribute the module inputs/outputs to pads. The backpane PCB's are mounted on hinged standoffs to the front panel so they can be flipped down. The front panel components are wired to the backpane PCB's and not to the module boards directly, so the module boards can be plugged in and out. The normalized inter-module connections are also part of the backpane PCB's. I used 3.5mm (1/8") jacks with normally closed switches; the normalized patch connection goes to the N.C. switch, so that it connects to the jack input when there is no plug inserted. The jack input then goes to the module. When a patch cord is plugged in, it breaks the normalized connection and overrides it with whatever is on the other end of the patch cord. Only module inputs are wired this way. I used 18ga wire to .156" connectors for the power supply distribution. Some modules share power supply connections, but only those I deemed would not have interaction problems. The PowerOne +/- 15v supply is connected to my power supply distribution board, which also houses my homegrown +5v supply. All the power connection come in to this distribution board, which provides a star connection. Case |