Frequency Central Raging Bull Build Documentation

Based on the legendary moog taurus mk i vcf and vca

Frequency central

Build documentation for:

Raging bull

Based on the legendary Moog Taurus Mk I VCF and VCA.

10K Lin

50K Rev Log 10K Lin

10K Log

Key to PCB screen print:

n: This signifies NPN BC547 transistors. Note the correct pinout as shown by the half circles.

p: This signifies PNP BC557 transistors. Note the correct pinout as shown by the half circles.

The PCB shows the correct orientation for BC547/BC557. Other transistor types can be used (eg

2N3904/2N3906), but please observe the correct pinout.

Please observe the correct polarity of the electrolytic capacitors.

Gnd: ground connection between PCB and all sockets

In 1: wire to Audio1 socket

In 2: wire to Audio2 socket

Out: wire to output socket

CV1, VCA, +12V: wire to VCA CV source select switch

CV1: wire to CV1 socket

CV2: wire to CV2 socket

Table of Contents

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Page 1 Frequency central Build documentation for: Raging bull Based on the legendary Moog Taurus Mk I VCF and VCA. 10K Lin 10K Lin 50K Rev Log 10K Lin 10K Log 10K Log Key to PCB screen print: n: This signifies NPN BC547 transistors. Note the correct pinout as shown by the half circles.
Page 2 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.
Page 3 Underside of the PCB showing: Ground bus between sockets and PCB Connections between inputs/output and PCB VCA source select switch connections I use solid core for all of the above. RDH 02/04/14 http://www.frequencycentral.co.uk/...