AtomoSynth Transmon User manual

AtomoSynth Transmon, VCA matrix mixer.

The Atomosynth Transmon is a 4-input and 4-output matrix mixer eurorack module, featuring 8
bipolar attenuators and 8 individual VCAs, and many other utilities, it gives you great flexibility for
mixing, controlling, and routing Audio or Voltage with a small footprint.
● Voltage and Audio mixing
● 4-input channels. “1, 2, 3, 4.”
● 4-output channels “A, B, C, D”
● Channel A, includes 4 attenuators which can be switched to unipolar or bipolar
(attenuverters)
● Channel B, includes 4 attenuverters (bipolar attenuators) with individual output jacks.
● Channel C and D, include 4 voltage-controlled amplifiers each (VCA), each one with
individual Control Voltage input and signal output jacks.
● Each channel features a master knob to adjust the output level.
● The Trasmon can be expanded by connecting more Transmon units to its internal input and
output bus connectors.
● Each input features an internal jumper to connect a normalized 12V offset signal to the input
(disabled by default)
● 100% analog signal path.
● Power on led.
● Current draw: 72mA +12V. 59mA -12V. 0mA 5V
● 24HP wide.
● 25mm deep.

Channels Description:
A channel.
● In the first row, there are the global input connectors labeled 1,2,3 and 4 (inputs are marked
with a square)
● The knobs 1A, 2A, 3A, and 4A control the level of each input and the mix is output at the A
connector.
● The A output level is controlled by its master knob located above it (mini knob).
● The A row has a mode switcher, when it is set in the B position (bipolar), the knobs (1A, 2A,
3A, 4A) become bipolar attenuators also called attenuverters. When set in the U position
(unipolar), the knobs (1A, 2A, 3A, 4A) become unipolar attenuators.
B channel
● The knobs 1B, 2B, 3B, and 4B control the level of each input and the mix is output at the B
connector.
● The B output level is controlled by its master knob located above it (mini knob).
● The knobs 1B, 2B, 3B, and 4B are bipolar attenuators (attenuverters)

● Each attenuverter has an individual output connector. When a cable is connected to one
output, its signal will be disconnected from the mix in the B channel.
● In this row is located the power LED, it indicate that the mixer is powered.
C channel
● The C channel features 4 VCA (voltage-controlled amplifier) Each VCA has a maximum of
2X gain.
● The knobs 1C, 2C, 3C, and 4C control the output level of each VCA and the mix of them is
output at the C connector.
● The C output level is controlled by its master knob located above it (mini knob).
● The knobs 1C, 2C, 3C, and 4C are unipolar attenuators.
● Each VCA has individual CV input and output connectors. Each CV input controls the level of
its respective VCA. When a cable is connected to one of the individual outputs, its signal will
be disconnected from the mix in the C channel.
D channel
● The D channel works identically to the C channel, refer to the previous section.

Connecting 2 or more Transmon Units.
● The Transmon can be connected to other Transmon units to expand the number of input
channels.
● In the back of the unit (circuit panel), there are 2 connectors labeled output bus and Input
bus.
● Use a 4-wire Molex connector and connect the output bus of one unit (slave unit) to the input
bus of the other (master unit).
● When 2 or more units are connected, and a cable is connected to one output of one of the
slave units, it will disconnect it from the main mix in the master unit.
Using the Offset voltage.
● At the back of the unit (circuit panel), there are 4 connectors (2-pin connectors). Use a
jumper connector to enable the offset voltage for the correspondent input channel.
● The channel will be connected to the +12V power thru a safety resistor.
● When the offset voltage is enabled, always remember to connect a cable to the Trasmon
output first and then to the other module to avoid the risk of damaging the modules.
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