Raging Bull is based on the legendary Moog Taurus Mk I VCF and VCA. It has a lovely, thick Moog-like quality, which is further enhanced by the drive you can get out of its VCA at higher settings.
A big part of the sound of the Taurus was the way in which the VCF interfaced with the VCA, so on Raging Bull the VCA is always in the audio path. A toggle switch allows you to select ‘always open’ or CV control of the VCA from CV input 1.
My good buddy Matt Preston (matttech) has kindly done a suite of demos of this module, which can be found here:
Raging Bull PCB: £15 GBP
Raging Bull (10HP): £15 GBP
Original version: Raging Bull Build Doc
2018 version: Rev 2.0 Oct 2017 build doc
Rev 2.0 uses additional opamp stage to boost output. a couple of resistor and capacitor changes.
Schematic: Raging Bull Schematic
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