Another breakout box (DB25 this time) for a friends growing workbench setup. The other end will be the breadboard she's actually working on, even bigger and with more connections than mine.

She's into guitar effects and modular synth stuff, so she needs some space to work on. That's also the reason why there are 1/4" and 1/8" jacks.

There's a special long DB25 cable she built for this. It have two coaxial audio cables with seperated shield and isolation, that's what goes to the two top jacks. They are isolated from everything else and also each other. The switch at the jacks is a 3PDT ON-OFF-ON switch, so these jacks can be connected to the coaxial cables on the DB25 (lever down), to each other (for bypassing, lever up) and no nothing at all (isolated, lever in the middle).

All other conductors in the cable are six pairs of foil shielded twisted pairs with a common shield, and seperate thicker conductors. Four of these pairs are wired to the TRS jacks on the top, always one 1/4" and one 1/8" in parallel. The last two pairs are for the DIN5 sockets at the back, they both wired in parallel (seems to be quite usual connections for synth stuff to sync different signals at once). The three single conductors goes to the barrel jack at the side and to the push button at the bottom.

It's a re-used case, that's why there are three patched holes at the bottom. But as it will get labeled this won't be visible anymore. Nearly all of these parts are re-use, the only new things are the 1/8" jacks (which she has tons of, cause this is the basic connector on synth stuff).

Took me some hours to build and test that thing, but everything works great now :)