A classic MS-20 VCF Clone for Eurorack, in 4HP.
This design is a classic, and many variations can be found across the internet and in many synthesizers and modules. It is based on the late Korg MS-20 VCF schematics which is a variation of the Sallen-Key 2nd-order filter.
(This variation adds a first buffer compared to the original Sallen-Key structure).
The filter can be switched from “Low Pass” to “High Pass” mode.
Attention! This project is rather old and needs some adjustments!
- Aaron Lanterman’s “Sallen-Key Filters & the Korg MS-20 VCF (Analog Circuits for Music Synthesis)” video on Youtube
Other VCF based on the MS-20 filter:
- synthdiy.com wiki
3 thoughts on “MS-20 VCF Clone”
Could you clarify the schematic for me – I want to make sure I’m reading it correctly. There’s three points within the circuit labelled ‘exp_out’, together with a test point; I’m assuming that these are all common (based off the similarity to René Schmitz’s design).
You’re absolutely right, ‘exp_out’ is a *label*, a way to tell KiCad things are connected, but without the need to draw a line.
It’s just a convenient way to not overcharge too much the drawings, particularly here, where the Iabc pins of the OTA are oriented toward the bottom… 🙂
Yep yep! I’m just so used to seeing and using global labels in KiCad that anything that isn’t in a ☖ or ⛉ sort of shape doesn’t register the same to me 🙂