A Kosmo version of the Kassutronics transistor ladder filter.
Find the documentation and BOM here: (https://github.com/kassu/kassutronics/tree/master/documentation/Transistor%20Ladder%20Filter)
You need to match the transistors, which is a bit boring. Those that I got where already pretty close (within the recommended 2mV limit), but some outliers, so maaaybe you could just try without matching.
Go download the latest gerber files here. Then send them to your favorite PCB Manufacturer (I use jlcpcb). Make sure you check "Specify a location" at "Remove Order Number" for the panel.