This is a 4-pole diode-ladder low pass filter. Useful for big classic analog filter sweeps. One audio and two cv inputs.
This module is designed for 12V systems. Getting it to work on a 15V system may require adjusting a couple of resistor values, but it's untested so far. It does not require hand-matching diodes or transistors, though doing so may improve results.
For complete descriptions of the way the module is used, and how to build it, including schematics and parts list; download this PDF file.
Boards are available now. Price for 1 PCB set is is $8.
Unfinished eurorack
panels are available for this project, they are 6HP and cost $8 each.
There is
more information here about panels. If you're interested in drilling your own panel for
this project, feel free to use my
drill guide. That image should be printed at 300dpi for proper
scaling.
