Intellijel Quadratt 1U User manual
5/30/2019 Quadratt 1U Manual - Google Docs
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Quadratt 1U Manual
Quadratt 1U
Quad attenuator, attenuverter, mixer and DC voltage source
Manual Revision: 2019.05.30
5/30/2019 Quadratt 1U Manual - Google Docs
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Quadratt 1U Manual
Table of Contents
Table of Contents
Compliance
Installation
Before Your Start
Installing Your Module
Overview
Usage Examples
Front Panel
Controls
Inputs & Outputs
Technical Specifications
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Quadratt 1U Manual
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
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Quadratt 1U Manual
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 Your Start
Intellijel Eurorack modules are designed to be used with a Eurorack-compatible case and power
supply. We recommend you use Intellijel cases and power supplies.
Before installing a new module in your case, you must ensure your power supply has a free
power header and 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 your case has enough free space (hp) to fit the new module. To
prevent screws or other debris from falling into the case and shorting any electrical contacts, not
leave gaps between adjacent modules, and cover all unused areas with blank panels. Similarly,
do not use open frames or any other enclosure that exposes the backside of any module or the
power distribution board.
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Quadratt 1U Manual
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.
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. Different
modules use different ways to indicate the -12V pins.
Some may be labelled with “-12V;” a white stripe next
to the -12V pins; the words “red stripe;” or some
combination of these. Additionally, some modules
may have shrouded headers, thus preventing
backward connections.
Most modules will come with the cable already connected but it is good to double check the
orientation. Be aware that some modules may have headers that serve other purposes so
ensure the power 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 “-12V” and a thick
white stripe.
If you are using another manufacturer’s
power supply, check their documentation for
instructions.
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Quadratt 1U Manual
Once connected, the cabling between the module and power supply should resemble the
picture 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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Quadratt 1U Manual
Overview
Quadratt is a four channel active/buffered attenuverter and summing mixer. Each channel has a
knob, which can function as a unipolar attenuator or a bipolar attenuverter, depending on the
setting of its corresponding two-position switch.
Each input is normalled to a precision +5V DC voltage source. With nothing plugged into the
jacks, each knob controls a voltage range of 0 -to- +5V or -5V -to- +5V depending on the
position of the mode switch.
Each output is normalled to mix into the output of the channel to its right making it possible to do
sub mixes in groups of 2, 3 or all four channels.
NOTE: Earlier versions of Quadratt had a different type of physical switch and slightly different
labelling, but are otherwise identical to the version illustrated and described by this manual .
Usage Examples
This humble collection of simple parameters provides a wealth of useful functions to the modular
synthesist. Here are some basic examples of how you might employ Quadratt in your patches:
●Attenuation : Assume you want to subtly modulate filter resonance, but your filter of
choice doesn’t have a built-in attenuator on its resonance CV input. If you were to plug
the output of an LFO directly into the resonance CV input on your filter, you’d be
modulating it at full amplitude — meaning your LFO would cycle the resonance from
“none” to “ear shattering squelch” and back again. But what if you just want resonance to
undulate a little bit? Quadratt to the rescue!
Plug the output of your LFO into the Quadratt’s INA , then plug OUTA into your filter’s
resonance CV jack. You’ll now be able to “dial down” the peak-to-peak amplitude of the
LFO using the Quadratt’s corresponding attenuator knob.
●Inversion : Assume you want to control a module with an envelope. Normally, voltage
increases during the attack section of an ADSR, then decreases during the decay or
release segment. But what if you want the inverse? What if you want some sonic
attribute to get more pronounced as the signal decays, not less? For this you need to
invert the envelope. Once again, Quadratt to the rescue!
Plug the output of your envelope into Quadratt’s INA , set ChannelA’s polarity switch to
-/+ , then turn its attenuator knob counterclockwise past 12:00 — an inverted envelope
now appears at Quadratt’s OUTA .
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Quadratt 1U Manual
●Voltage Offsets : Assume you have a Sample & Hold module sending random notes to
an oscillator, only you want to constrain that unruly 10+ octave range of notes to just one
or two octaves in the bass range. One way to do this is to use two channels of a
Quadratt.
Plug your S&H output into Quadratt’s INB ; connect OUTB to your oscillator’s pitch
input; then use the Channel B attenuator to limit the range of notes to an octave or two.
Next, use Quadratt’s Channel A (into which nothing is connected) to negatively offset the
note range down into the bass frequencies. Do this by setting Channel A’s polarity switch
to -/+ , then turning the corresponding attenuator knob counterclockwise past 12:00.
Because nothing is plugged into Quadratt’s OUTA , OUTB contains a sum of Channels
A and B, giving you both the reduced note range and the lower frequencies you desire.
●CV Mixing : What if you want to modulate some parameter with more than one control
voltage at a time? Perhaps you want to send a square wave to modulate a filter’s cutoff
frequency giving it a steady “pulsing” sound while simultaneously sweeping it with a
slow, triangular LFO so that the pulsing sound rises and falls over time. Again, Quadratt
is on the case. And, once again, you’ll be using two channels.
Plug the square wave output of the “pulsing” LFO into Quadratt’s INA and connect
OUTB to your filter’s frequency CV input. Use ChannelA’s attenuverter to set the
amount of pulse you want to hear. Next, plug the triangle wave output of the “slow
sweeping” LFO into Quadratt’s INB . OUTB now contains of sum of Quadratt’s AandB
channels. Use Channel B’s attenuverter to set how much the pulse sweeps up and down
the frequency band. You now have two different CV sources controlling one destination.
●Audio Mixing : Audio is a voltage too. So you’re probably asking yourself, “can I use
Quadratt to mix multiple channels of audio together as well?” Yes, you can!
Set all of Quadratt’s polarity switches to UNI and turn all its knobs fully counterclockwise .
Plug the output of one oscillator in INA , another into INB , and so on. Plug only OUTD
into your audio amplifier, leaving OUTS A-C unconnected. Rotate ChannelA’s attenuator
clockwise and you’ll hear the oscillator connected to INA . Turn ChannelB, Cand D’s
attenuators clockwise to add their corresponding inputs to the mix.
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Quadratt 1U Manual
Front Panel
Controls
1. Channel A attenuator
Attenuates the voltage level present at INA. The behaviour of the knob depends on the
position of the corresponding polarity switch. The attenuation amount is linear.
2. Channel A polarity switch
This is a 2-position switch that sets the polarity of the OUT A signal.
UNI: With the switch in the left UNI position, the channel functions as a standard
attenuator. The full value of the channel’s input voltage is passed through to the output
when the attenuator knob is fully clockwise . None of the input voltage passes through to
the output when the attenuator knob is fully counterclockwise ; and half the voltage
passes through to the output when the knob is at the 12:00 (straight up) position.
-/+: With the switch in the right -/+ position, the channel acts as a bipolar attenuverter.
The full value of the channel’s input voltage is passed through to the output when the
attenuator knob is fully clockwise . The inverse of the input voltage is sent to the output
when the knob is fully counterclockwise ; and none of the input voltage passes through to
the output when the knob is at the 12:00 (straight up) position.
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Quadratt 1U Manual
3. Channel B attenuator
Behaves the same as the Channel A attenuator but for channel B.
4. Channel B polarity switch
Behaves the same as the Channel A polarity switch but for channel B.
5. Channel C attenuator
Behaves the same as the Channel A attenuator but for channel C.
6. Channel C polarity switch
Behaves the same as the Channel A polarity switch but for channel C.
7. Channel D attenuator
Behaves the same as the Channel A attenuator but for channel D.
8. Channel D polarity switch
Behaves the same as the Channel A polarity switch but for channel D.
Inputs & Outputs
A. IN A
Input for channel A.
With no cable plugged in, Quadratt sends a 5V DC voltage into Channel A, which you
can attenuate (or invert) with the Channel A attenuator knob. For example, with nothing
plugged into Channel A and the Channel A knob fully clockwise, 5V is sent out channel
A. If the Channel A knob is fully counterclockwise and its polarity switch is set to UNI ,
then 0V is sent out Channel A. if the Channel A knob is fully counterclockwise and its
polarity switch is set to -/+ , then -5V is sent out Channel A.
B. IN B
Input for channel B. With no cable plugged in, Quadratt sends 5V into Channel B, which
you can attenuate (or invert) with the Channel B attenuator knob.
C. IN C
Input for channel C. With no cable plugged in, Quadratt sends 5V into Channel C, which
you can attenuate (or invert) with the Channel C attenuator knob.
D. IN D
Input for channel D. With no cable plugged in, Quadratt sends 5V into Channel D, which
you can attenuate (or invert) with the Channel D attenuator knob.
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Quadratt 1U Manual
E. OUT A
Output for channel A, which is the attenuverted value of IN A.
F. OUT B
Output for channel B, which is the attenuverted value of IN B. With no cable connected
to OUTA, this jack outputs the sum of channels A and B.
G. OUT C
Output for channel C, which is the attenuverted value of IN C. With no cable connected
to OUTA or OUTB, this jack outputs the sum of channels A, B and C. Plugging a cable
into OUTA removes it from OUTC, meaning OUTC = OUTB + OUTC. Plugging a
cable into OUT B removes both OUTA and OUTB from OUTC.
H. OUT D
Output for channel D, which is the attenuverted value of IN D. With no cable connected
to OUTSA,BorC, this jack outputs the sum of channels AthroughD. Plugging a cable
into OUTA removes it from OUTD, meaning OUTD = OUTSB+C+D. Plugging a
cable into OUTB removes both OUTA and OUTB from OUTD, meaning OUTD=
OUTC+D. Plugging a cable into OUTC removes OUTSAthroughC from OUTD.
Technical Specifications
Width
28 hp
Maximum Depth
25 mm
Current Draw
24 mA @ +12V
23 mA @ -12V
Page 10
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