Fast and Bulbous VCF
A four-stage SSI2140 low-pass filter and phaser, stage by stage
Panel · 40.6 × 128.5 mm
Description
A filter on the SSI2140, based on the SSM2040 with a few updates, after C. Anderton's design in Device 1-6, modified for the SSI2140 and Eurorack: a module that switches between a phaser and a VCF. Four switches, one per OTA stage, set each stage to low-pass (FILTER) or all-pass (PHASER); two or three in one mode and one or two in the other is a lot of fun. OUT is taken from the fourth stage; DRY MIX mixes the incoming signals into it, more common in phaser mode, though there are no rules. POLES is a weighted mix of the outputs of each pole: a bit shy with every switch on low-pass, it perks up nicely with one or more on phaser.
Key features
- IN 1, IN 2, 1V/OCT, FR CV and Q CV in; OUT and POLES out
- IN 1, DRY MIX, FREQ, FREQ CV, Q and Q CV knobs
- Four FILTER / PHASER switches, one per OTA stage
- 8 HP; Nonlinearcircuits publishes no current draw, depth or assembled price (it sells the DIY PCB and panel), and ModularGrid lists none