Wavefolder

The circuit here is based on the Yusynth --- Wavefolder with minor tweaks to make it more Eurorack friendly. The changes I've made are thus:

• Selected resistors appropriate for +/-12V rails,
• Added polarity protection so that a backward power header doesn't fry anything (twin series schotty diodes: BAT54SL),
• Utilizing matched diode arrays for fidelity and compact size.
• Full surface mount design.

The Yusynth page is a treasure trove of information about this circuit that I am too amateur to claim as my own; please read that outstanding page before using this circuit. The page provides many details and other implementations of this circuit that you may find suitable.

The KiCAD project here uses the library/footprints found in my companion repo.

Width

4hp on a standard 3U rack.

Inputs

3 knobs:

• shape to adjust how much of the dry signal passes through to the output
• range to set the folding level
• cv lvl set bounds on CV folding level

2 jacks:

• cv to dynamically change the folding level
• in where the incoming audio signal goes

Outputs

1 jack for folded audio signal

Vendors

There are part numbers in the BOM for many of the parts (not for basic passives though) at the following vendors:

• Mouser: Needs no introduction. Get your ICs from here (or digikey).
• Tayda Electronics: Good supplier for passive components; audio jacks, and potentiometers. Their audio jacks are slightly smaller than the thonkiconn from thonk.
• Love My Switches: Has really good knobs to go on those potentiometers!
• OSHPark: Fast and (relatively) cheap PCB manufacturer. Prototype run pending.

Changelog