Intellijel Duatt 1U

Compliance

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Changes or modifications not expressly approved by Intellijel Designs, Inc. could void the user's authority to operate the equipment.

Any digital equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.

This device meets the requirements of the following standards and directives:

• EMC: 2014/30/EU
• EN55032:2015 ; EN55103-2:2009 (EN55024) ; EN61000-3-2 ; EN61000-3-3
• Low Voltage: 2014/35/EU
• EN 60065:2002+A1:2006+A11:2008+A2:2010+A12:2011
• RoHS2: 2011/65/EU
• WEEE: 2012/19/EU

Installation

This module is designed for use within an Intellijel-standard 1U row, such as contained within the Intellijel 4U and 7U Eurorack cases. Intellijel's 1U specification is derived from the Eurorack mechanical specification set by Doepfer that is designed to support the use of lipped rails within industry standard rack heights.

Before You Start

Intellijel Eurorack modules are designed to be used with a Eurorack-compatible case and power supply. Intellijel recommends using Intellijel cases and power supplies.

Before installing a new module, ensure your power supply has a free power header and sufficient available capacity to power the module:

• Sum the specified +12V current draw for all modules, including the new one. Repeat for -12V and +5V current draws. Current draw is specified in each module's technical specifications.
• Compare these sums to your case's power supply specifications.
• Proceed with installation only if all sums are within the power supply's specifications. Otherwise, remove modules to free up capacity or upgrade the power supply.

Ensure your case has enough free space (hp) for the new module. To prevent screws or debris from falling into the case and shorting electrical contacts, do not leave gaps between adjacent modules. Cover unused areas with blank panels. Avoid open frames or enclosures that expose the backside of modules or the power distribution board.

A tool like ModularGrid can assist in planning. Failure to adequately power modules may result in damage. If unsure, contact Intellijel support.

Installing Your Module

When installing or removing a module, always turn off the power to the case and disconnect the power cable. Failure to do so may result in serious injury or equipment damage.

Ensure the 10-pin connector on the power cable is connected correctly to the module. The red stripe on the cable must align with the -12V pins on the module's power connector. Modules may indicate -12V pins with labels like "-12V", a white stripe, or the words "red stripe". Some modules have shrouded headers to prevent backward connections.

Most modules come with the cable pre-connected, but it's good to double-check orientation. Some headers may serve other purposes; ensure the power cable connects to the correct one.

The other end of the cable, a 16-pin connector, connects to the Eurorack case's power bus board. Ensure the red stripe aligns with the -12V pins on the bus board. Intellijel power supplies label these pins with "-12V" and a thick white stripe.

If using another manufacturer's power supply, consult its documentation.

Before reconnecting power, double-check that the ribbon cable is fully seated on both ends and all pins are correctly aligned. Misaligned or backward pins can damage the module, power supply, or other modules.

After confirming connections, reconnect the power cable and turn on the system. Check that all modules have powered on and are functioning correctly. If anomalies occur, turn off the system immediately and re-check cabling.

Front Panel

Controllers

[1] Channel Attenuator (x2): These knobs linearly attenuate the voltage present at the input [A or B] of each channel. If no voltage is present at the input, the knobs attenuate a +5V DC voltage. The Channel Polarity Switch [2] determines the range and behavior of the knob.

[2] Channel Polarity Switch (x2): This switch sets the polarity of the signal sent to the output [C or D] of each channel.

• UNI: The Channel Attenuator Knob [1] functions as a standard attenuator. The full input voltage (or +5V DC if unpatched) passes through when the knob is fully clockwise. Zero voltage passes when fully counterclockwise. Half voltage passes at the 'noon' position.
• -/+: The Channel Attenuator Knob [1] acts as a bipolar attenuverter. The full input voltage (or +5V DC if unpatched) passes through when the knob is fully clockwise. The inverse of the input voltage is sent to the output when fully counterclockwise. Zero voltage passes at the 'noon' position.

[3] Ax2 Switch: In the up (on) position, this switch doubles the voltage appearing at Channel A's input [A].

• Example: With Channel A input unconnected, polarity set to -/+, attenuator fully clockwise, and Ax2 switch down (off), Duatt sends 5V to Channel A's input.
• With the Ax2 switch up (on), Duatt sends 10V (5V x 2) to Channel A's input. Rotating the knob fully counterclockwise sends -10V (-5V x 2).
• The Ax2 switch conveniently doubles input voltage or sets a +10V or -10V DC offset for signals patched into Channel B.

Inputs & Outputs

[A] IN A: Input for Channel A. Voltage is doubled (x2) if the Ax2 switch [3] is on (up).

When no cable is plugged into IN A, Duatt sends a 5V DC voltage into Channel A, which can be doubled to 10V (5V x 2) with the Ax2 switch. This input voltage can then be inverted with the polarity switch and scaled with Channel A's attenuator knob.

[B] IN B: Input for Channel B.

When no cable is plugged into IN B, Duatt sends a 5V DC voltage into Channel B. This input voltage can be inverted with the polarity switch and scaled with Channel B's attenuator knob.

[C] OUT A: Output for Channel A. If nothing is plugged into OUT A, its voltage is bussed to Channel B and summed with its output voltage. Plugging a cable into OUT A prevents it from being summed with Channel B's output [D].

[D] OUT B: Output for Channel B. If nothing is plugged into OUT A, OUT B contains the sum of Channel A and Channel B's output voltages.

Usage Examples

These parameters offer many functions for the modular synthesist. Here are some basic examples:

• Attenuation: To subtly modulate filter resonance without a built-in attenuator. Plug an LFO output into Duatt's IN A, and OUT A into the filter's resonance CV jack. Use Duatt's attenuator knob to control the LFO's peak-to-peak amplitude, allowing for subtle undulation rather than full amplitude modulation.
• Inversion: To control a module with an envelope where an attribute should increase as the signal decays. Plug an envelope output into Duatt's IN A, set Channel A's polarity switch to -/+, and turn its attenuator knob counterclockwise past 12:00. An inverted envelope will appear at Duatt's OUT A.
• Voltage Offsets: To constrain a Sample & Hold module's random notes to a specific octave range and shift it to bass frequencies. Plug the S&H output into Duatt's IN B, connect OUT B to the oscillator's pitch input, and use Channel B's attenuator to limit the note range. Use Channel A (unconnected) with its polarity switch set to -/+ and the attenuator turned counterclockwise past 12:00 to negatively offset the note range into the bass frequencies. OUT B will sum Channels A and B, providing the desired reduced note range and lower frequencies.
• CV Mixing: To modulate a parameter with multiple control voltages simultaneously. For example, mixing a square wave and a triangular LFO. Plug the square wave LFO into Duatt's IN A and connect OUT B to the filter's frequency CV input. Use Channel A's attenuverter to set the square wave's pulse amount. Plug the triangle wave LFO into Duatt's IN B. Since nothing is plugged into OUT A, OUT B sums Channels A and B. Use Channel B's attenuverter to control the sweep amount of the pulse across the frequency band, allowing two CV sources to control one destination.
• Audio Mixing: To mix audio signals. Set both polarity switches to UNI and knobs fully counterclockwise. Plug one oscillator's output into IN A and another into IN B. Connect OUT B to the audio amplifier, leaving OUT A unconnected. Rotating Channel A's attenuator will play the oscillator connected to IN A. Increasing the Channel B attenuator adds IN B to the mix.
• Instant Voltage Doubling: Channel A has a switch to double the input voltage, useful for temporarily increasing a CV's impact on a parameter before returning it to its original level.

Technical Specifications