is used to connect up to three Eurorack 3.5 mm patches to the Microrack setup.
Schematic_jacket-1.0_2025-05-21.pdf (48.6 KB)
for power the breadboard setup. It is possible to power microrack by barrel jack (5 to 12 V) or USB type-C
Schematic_MOD-PWR-1.3_2025-05-21.pdf (119.9 KB)
There are images of the latest released version of the modules. This is not the final product, development is in progress.
if there were a backer add-on with a few jack modules, I’d add them to my kickstarter pledge now, rather than having to wait for them to be orderable later.
Yes, we’ve just added More I/O Jacks Addon. Check them out at the order page.
With the input jack module it might be an idea to use stereo inputs. That way you can get 6 mono inputs using adapters and you will only have to use one jack if you want to run a stereo device into the system. This doubles up the inputs without taking up any additional real estate.
The jacket module is a very simple passive module designed for integration with modular systems and synthesizers that operate with modular signal levels. Typically, in this case, they have mono jack outputs.
To connect line-level signal sources, an input jack module is used, where you can set the gain.
Ah yeah definitely a lot better using the module you mentioned for stereo audio.
Would it still not be useful to use trs to be able to double up the amount of inputs using external stereo to mono splitters (ive attached an image) or would the duplicate output for each input be more useful?
That -12V regulator on the DC module is somewhat… unorthodox. Took me a while to figure out how it can even work. But using the same chip for two different purposes (+5V and -12V) certainly keeps the BOM short, and if it works, it works. 
Also, the +5V will probably be a bit weak, if the input voltage is only 5 Volts. No harm done though, as the modules follow the fine old tradition of never trusting the 5V rail for analog purposes; it is used mainly for the LEDs. In fact, reducing the input voltage to slightly below 5 Volts might be a neat trick to dim the LEDs for those of us who like it less bright.
Of course, you can use this cable/adapter. Keep in mind there is only one gain/volume knob for both channels, so in some cases two separate input modules will be more useful.
You’re right, in case of 5V USB power it remains about 4.5 V after cable voltage drop and protection diode. And yes, this 5V line used only for LED and some digital chips, so it keeps working even from this voltage.
