This is the PCB for my forthcoming 'mcu328' desktop/Eurorack module kit - it's a noise-maker based around the Arduino Nano board which can be used for pretty much whatever you want, within reason.

There are four analogue inputs with level controls, plus 4 PWM outputs with switches to allow changing between 'raw' PWM or filtered, which will provide a smoothed analogue voltage suitable for sending to VCOs, filters and the like. In addition, the board can be powered in one of three different ways: via a 5.5/2.1mm center-positive DC jack, a 10-pin Eurorack connector (only uses 12V and GND) or by powering the Arduino from a suitable USB supply (not recommended for 'performance' use, but handy if you're reflashing the firmware)

Follow the GitHub link for a BOM and some pretty basic firmware.

The kit is 100% through-hole - no surface-mount components are required. The board measures approximately 82x78mm