I migrated from a tangle of jumper wires and breadboards to a more permanent setup.

The red-green-white cable is a pigtail that came with the LED strip. The connector at its end seems to be semi-standard used by various RGB LED strips and matrices. The thick black cable is a USB cable salvaged from a cheap USB 3 hub. The business end of that cable is a USB A plug used to supply 5V power from a battery or phone charger.

And here how it looks with everything plugged in. The second color oscillator board is still missing.

I should clean up those solder joints with a bit of IPA. 🙄