Frequency central
Build documentation for:
Raging bull 2.0
Based on the legendary Moog Taurus Mk I VCF and VCA.
•
Rev 2.0 PCB uses a TL072 instead of an LF351. The additional opamp stage is use to increase
the output level of the module.
•
There are also a couple more resistors (1K and 33K) and a 10uF capacitor is replaced with a
220uF capacitor.
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.
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
