Intellijel mJack User manual
µJack Manual
µJack
Headphone & Stereo Line Output
Manual Revision: 2018.05.16
µJack Manual
Overview
The µJack functions as the audio output device for your modular system. It converts
modular-level voltages to line-level outputs suitable for driving amplifiers, recording devices, or
DAW interfaces. Headphone monitoring is also supported via a low noise built-in headphone
amp capable of driving high impedance studio headphones.
Features
● Headphone amp capable of driving high impedance headphones via 1/4″ stereo Neutrik
jack.
● L and R +4dBv unbalanced line level outputs on TRS 1/4″ Neutrik jacks.
● Switch for mono/stereo monitoring.
● Left input normalled to Right input.
● Individual level attenuators and global stereo headphone gain control.
● 6-pin header on back of module and ribbon cable for connecting directly to the outputs of
an Intellijel Dubmix or Azimuth II.
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µJack Manual
Table of Contents
Overview
Features
Table of Contents
Installation
Before Your Start
Installing Your Module
Front Panel
Controls
Inputs & Outputs
Technical Specifications
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µJack Manual
Installation
Intellijel Eurorack modules are designed to be used with a Eurorack-compatible case and power
supply.
Before Your Start
Before installing a new module in your case you must ensure your case’s power supply has
sufficient available capacity to power the module:
● Sum up the specified +12V current draw for all modules, including the new one. Do the
same for the -12 V and +5V current draw. The current draw will be specified in the
manufacturer's technical specifications for each module.
● Compare each of the sums to specifications for your case’s power supply.
● Only proceed with installation if none of the values exceeds the power supply’s
specifications. Otherwise you must remove modules to free up capacity or upgrade your
power supply.
You will also need to ensure you have enough free space (hp) as well as free power headers in
your case to fit the new module.
You can use a tool like ModularGrid to assist in your planning. Failure to adequately power your
modules may result in damage to your modules or power supply. If you are unsure, please
contact us before proceeding.
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µJack Manual
Installing Your Module
When installing or removing a module from your case 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
before proceeding. The red stripe on the
cable must line up with the -12V pins on the
module’s power connector. The pins are
indicated with the label -12V, a white stripe
next to the connector, the words “red stripe”,
or some combination of those indicators.
Most modules will come with the cable already connected but it’s a good idea to double check
the orientation before proceeding. Be aware that some modules may have headers that serve
other purposes so ensure the cable is connected to the right one.
The other end of the cable, with a 16-pin
connector, connects to the power bus board
of your Eurorack case. Ensure the red stripe
on the cable lines up with the -12V pins on
the bus board. On Intellijel power supplies
the pins are labelled with the words “-12V”
and a thick white stripe.
If you are using another manufacturer’s
power supply, check their documentation for
instructions.
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µJack Manual
Once connected, the cabling between a module and power supply should resemble the photo
shown below.
Before reconnecting power and
turning on your modular
system, double check that the
ribbon cable is fully seated on
both ends and that all the pins
are correctly aligned. If the pins
are misaligned in any direction
or the ribbon is backwards you
can cause damage to your
module, power supply, or other
modules.
After you have confirmed all the connections, you can reconnect the power cable and turn on
your modular system. You should immediately check that all your modules have powered on
and are functioning correctly. If you notice any anomalies, turn your system off right away and
check your cabling again for mistakes.
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µJack Manual
Front Panel
Controls
1. HEADPHONE Level
The large knob on the top of the µJack controls the level of the
headphone output.
2. MONO/STEREO Switch
This switch controls whether or not the output of the module is
mono or stereo. In mono mode (switch is to the left), the LEFT
and RIGHT inputs are summed internally. In this case both the L
and R outputs, as well as both channels of the headphone jack,
output the same signal.
3. LEFT Attenuator
This knob attenuates the level of the LEFT input. The signal is
unmodified when the knob is fully clockwise, otherwise the level is
reduced proportionally.
4. RIGHT Attenuator
This knob functions just as the LEFT Attenuator but for the
RIGHT audio channel.
Inputs & Outputs
A. LEFT Input
Any eurorack-level audio sent to this jack will be scaled down to
+4 dBu levels and sent out the LOut jack. Use the LEFT
Attenuator to further reduce the signal level.
B. RIGHT Input
Any eurorack-level audio sent to this jack will be scaled down to +4 dBu levels and sent
out the ROut jack. Use the RIGHT Attenuator to further reduce the signal level.
NOTE: The LEFT Input jack is normalled to the RIGHT Input jack, so if nothing is
connected to the RIGHT Input jack, then one signal fed into the LEFT Input jack will
feed both of the ¼” output jacks.
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µJack Manual
C. L Out
This jack carries the attenuated output of the modular-level signal sent into the LEFT
Input jack. It enables you to interface your modular gear with external mixers, power
amps or DAWs, and is an unbalanced +4 dBu ¼” output. For use with -10dBv systems,
simply dial back on the corresponding channel’s attenuator.
D. R Out
This jack carries the attenuated output of the modular-level signal appearing at the
RIGHT Input jack. Like the LOut jack, it enables you to interface your modular gear with
external mixers, power amps or DAWs, and is also an unbalanced +4dBu ¼”output,
which you can attenuate down to -10dbV levels.
E. HEADPHONE Output
This is a stereo ¼” output intended primarily for headphones. Its volume level is set with
the HEADPHONE Level knob, and you can monitor the Left and Right signals in either
stereo or mono, depending on the position of the MONO/STEREO switch.
Technical Specifications
Width
6 hp
Maximum Depth
26 mm
Current Draw
17 mA @ +12V
17 mA @ -12V
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Table of contents
