Rev. 5 – Jun 2020 Page 79 of 91
333
Figure 78: 333 interface.
A In/Out
A.1 Inputs
A.2 Semi-Normalled Inputs
A.3 Outputs
A.4 -6dB Switches
The 333 is an analog summing and distribution module
for Eurorack modular systems. It is composed of three
identical sections, each of those comprising a high-quality
summing amplifier with 3 inputs, and three inde-
pendently buffered outputs.
The summing amplifier circuitry and the system opti-
mization are derived directly from the CGM creative
mixer series, with the additional ability to handle signals
starting from DC.
1 DESIGN
Each of the three sections, red, yellow, and green, sums
up to three signals, plugged to any of its three inputs, and
distribute this sum to three independently buffered out-
puts.
The first input of yellow and green sections (A.2) is semi-
normalled to the after switch sum result of the previous
section (so the yellow to the red, and the green to the
yeow).
All the inputs are DC coupled, so you can use each sec-
tion to sum audio signals, control voltages as well as
merging clocks.
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