God's Box - Humpback - Eurorack VCF from thonk on Vimeo.
https://www.thonk.co.uk/shop/humpback/
"A full DIY kit for a 2-pole multimode filter reminiscent of the classic ‘SEM’ style state variable VCF. Special features include a hot rodded resonance circuit and increased frequency range."
This kit includes everything you need to build the module apart from tools and solder. The module is 8hp wide and is skiff friendly; 38mm deep. The kit is packed to the same high standards customers have come to expect from all Thonk kits.
Contents
Aluminium 8hp Eurorack panel – High Quality two colour Aluprint process
Red PCBs with ENIG gold traces
All electronic components required including matched transistor pair
Genuine and new/unused Rochester CA3080AE chips
Knobs, power cable, M3 rack screws
Description
The Humpback multimode voltage controlled filter is a 2-pole, CA3080 based implementation of the classic state variable architecture. The controls of the filter are as follows:
Filter cutoff – a hardwired DC voltage frequency control
CV inputs – two frequency CV inputs are included on the panel and controlled by attenutators.
Outputs – lowpass, bandpass, highpass and notch are available simultaneously
Signal input – one signal input is available on the panel
Resonance-resonance control is included and is hot-rodded to allow self-oscillation. In self oscillation the filter will produce a sine wave output."
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