NOTE: This module is part of a three board design. Make sure to print all three PCBs!

This build is my take on Moritz Klein's diode ladder design. I added a clipping section and a second filter so you can crank up the resonance while keeping the output at reasonable levels.

The module also has a switch for lowpass or bandpass modes.

See more info on my website: https://benjiaomodular.com/post/2022-03-11-mini-vcf/.

WARNING: This module is UNVERIFIED. I have printed v1.0 and fixed errors I've found in that initial version. Print v1.1 at your own risk! I will post an update on Instagram as soon as I've verified v1.1.

Versions

v1.1 - Quick fixes (Unverified)

This version fixes issues found in the initial release.

• Fixed orientation of Cutoff and Post-LPF knobs.
• Updated toggle switch footprint to a bit more space.
• Swapped clipping LED positions. Positive clipping now at the top row.
• Added missing labels for OpAmps, adjusted some unreadable labels.

v1.0 - Initial release

This is the first release of the module. I got it to work, but has a couple of issues.

• Issue: Cutoff and Post-LPF knobs are wired the opposite way.
• Issue: Holes for the toggle switch a bit too tight.