Schräg is an 8HP multimode filter module for the eurorack format, based off the Bastl Cinnamon.
This is a rework of the original Schräg by Barnaby Walters.
Schräg is effectively a repackaged Bastl Cinnamon:
- Multimode filter with independent outputs (2-pole LP, 2-pole HP, 1-pole BP)
- V/oct input
- Self-resonates for use as a sine oscillator
- Input with an attenuator and 5x gain switch
- Two character switches for altering the resonance tracking
- All-SMD construction in a DIY-friendly format, with 0603 handsoldering footprints, all components on the back of the circuit board
- Built mostly using standard and easily-available components
with a few modifications:
- Larger 8HP form factor, allowing for a big juicy cutoff knob and larger character and gain switches
- Voltage control over resonance, through an attenuverter
- FM input through an attenuverter, which works as a pitch fine-tune control with nothing patched
- A bi-directional power connector, with polyfuses
- An Interactive BOM (
bom/schraeg_iBOM.htmlonce you’ve cloned the repo locally) to aid in part placement - Schematics and PCB laid out using KiCAD
The additional functionality is achieved with a minimum of extra components, thanks to the two unused VCA cells in the original design.