This is a state variable filter which has a very simple design and is easy to build. The filter behaves similarly to vintage filters of the 1970s and 1980s and this is further reflected in the presentation of the controls. The two pole filter has -12dB per octave roll-off for high pass and low pass and a -12 db wide (-6dB either side) bandpass output.

It has voltage control of cutoff frequency (F). F and Q are adjustable with panel controls and the frequency is also adjustable from external sources using two F CV inputs, one of which can provide modulation in the positive or negative direction using a built in attenuverter.

The response of the filter can be switched in or out of bandpass mode. When bandpass mode is off the filter can be continuously swept between Low Pass, Notch and High Pass responses.

A demo of the filter

Filter used in patch with SEM

Videos, courtesy of Randy Piscione (also presented below).

IMPORTANT NOTE

This is a PCB and Panel set only. One high quality PCB and one front panel ONLY are included. You will need to purchase your own components and build your own module. Comprehensive build instructions and BOMs are provided to help you source the components needed and we even provide links to shopping carts to simplify sourcing those components. Some product photos above show COMPLETED build.

• Two pole 12dB filter
• High pass, low pass, notch and band pass outputs
• Attenuverter on CV input
• Exponential 1V/octave response
• Self-resonance configurable
• Two frequency CV inputs
• Input level control for smooth or overdriven sounds
• 6HP Eurorack with our panel

This is a low component count project so you can have high quality VCFs in your rack with minimum expense.

Build it yourself - This is a set of one high quality PCB and front panel ONLY for users who want to purchase their own components and build their own module. Some product photos above show COMPLETED build.

This module will fit perfectly into a 6HP Eurorack space.

Comprehensive manuals, parts lists and component shopping carts are provided in the documentation link for building, testing and using the module.