Key data
Liquid filter
| Parameter | Value |
|---|---|
| Width | 8HP |
| Depth | 25mm |
| +12V current | 35mA |
| -12V current | 35mA |
| Lifetime | 08/13 to 04/20 |
| Modulargrid | Link |
Original printed manual
Features
A multimode filter
- 2-pole band-pass.
- 2-pole low-pass.
- 4-pole low-pass.
- 4-pole low-pass processed by an internal VCA - the perfect "end of subtractive chain" output!
All the CV inputs you need
- Un-attenuated frequency CV, calibrated for 1V/Oct tracking of the self-oscillation tone over 4 octaves.
- Frequency CV with attenuverter.
- Resonance CV. Self oscillation starts at 4V. Control voltages above 5V are non-linearly compressed, for fine control of resonance overdrive.
- VCA level for the LP4>VCA output.
Specifications
- Cutoff knob range: 18Hz to 18kHz.
- Fully analog, based on the V2164 low noise/distortion quad VCA chip, and LM13700 OTA for that extra bit of non-linearity.
- Frequency CV inputs impedance: 100k.
- Audio input impedance: 75k.
- Resonance and VCA CV input impedance: 30k.
- All CV inputs handle audio-rate modulations.
Revisions and variants
2015
Hardware revision labelled "v4" with the following differences:
- Thonkiconn jacks.
- FM attenuverter has no center detent.
- Calibration trimmer soldered on the same side as the jacks, accessible from the side.