Frequency central
Build documentation for:
Raging bull 3.0
Based on the legendary Moog Taurus Mk I VCF and VCA.
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 3. This is a very flexible arrangement, for example:
1.
By sending an ADSR into CV3, the signal will go to the VCA CV input unattenuated and the
VCF CV input via the attenuator
2.
By sending a gate into CV3, and setting the attenuator to zero, the VCA can be gated while
the gate has no affect on the VCF
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.
