Intellijel Quadra Manuel utilisateur

Quadra & Expander Manual

Quadra & Expander

Quad Function / Envelope Generator

Manual Revision: 2018.08.22

Quadra & Expander Manual

Table of Contents

Table of Contents

Overview

Quadra Features

Additional Expander Features

Installation

Before Your Start

Installing Your Module

Quadra Front Panel

Controls

Inputs and Outputs

Expander Front Panel

Controls

Inputs and Outputs

Functions and Envelopes

Linear Versus Exponential Shapes

Quadrature Mode

ADSR Envelope Generation Using the OR Outs

Patch Examples

Technical Specifications

Page 1

Quadra & Expander Manual

Overview

The Intellijel Quadra and Expander modules comprise four parallel function generators (more

commonly referred to as “Envelope Generators,”) plus numerous CV controls. The Quadra

function generator has three modes, AD (Attack, Decay), ASR (Attack, Sustain, Release) and

Cycle (a perpetually repeating AD envelope, which acts like a unipolar LFO). Each function can

be configured to have a linear or exponential curve, and each features a wide time-base control

from 0.5ms to over 30 seconds. The Expander enhances Quadra’s core functionality by allowing

attenuated voltage control over Attack and Decay for each function generator; plus a

Quadrature mode and an analog OR mixer for each function generator pair.

This manual discusses both the Quadra and its optional Expander module.

Quadra Features

●Four function generators with Attack and Decay times ranging from from 0.5 milliseconds

to over 30 seconds.

●Three modes: AD (attack, decay), ASR (attack, sustain, release), Cycle (AD envelope

loops)

●Exponential and Linear envelope curves

Additional Expander Features

● Four End of Cycle pulse outputs corresponding to the four function generators.

● Voltage control of attack and decay (with attenuators) of all four envelopes

● Two analog OR (Also known as Peak Circuit) logic outputs that are normalled to the two

pairs of envelopes with attenuators.

● Special Quadrature modes.

 

Page 2

Quadra & Expander 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.

 

Page 3

Quadra & Expander 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 is good to double check the

orientation. 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 label “-12V” and a thick white stripe.

If you are using another manufacturer’s

power supply, check their documentation

for instructions.

Page 4

Quadra & Expander 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.

Page 5

Quadra & Expander Manual

Quadra Front Panel

Controls

1. ATTACK - This knob (x4)

controls the time of the attack

portion of the function (rising

from zero to the maximum

level). Slower times will create a

fade-in effect while faster times

are used for snappy percussive

sounds.

2. DECAY - This knob (x4)

controls the fall-to-zero time. In

ASR mode this will act as the

release time. In Cycle mode the

total time of ATTACK plus

DECAY sets the frequency of

the LFO.

3. Exponential/Linear Switch -

This switch (x4) changes the

attack and decay curves.

Depending on what you are

patching the Quadra into, this

setting may need to be

changed. For example if you

patch into an exponential VCA

you’ll probably use linear mode.

The fastest envelope times are

achieved when in linear mode.

4. Mode Switch - This switch (x4)

sets each function generator to

one of three modes: AD, ASR or

Cycle mode. AD is an envelope

that ignores the incoming gate

time and is simply triggered.

Page 6

Quadra & Expander Manual

This is often used with sequencers. ASR is similar to an ADSR in that it continues to

sustain while the input gate is high. Cycle mode acts like a unipolar LFO.

5. LED - The brighter this LED (x4), the higher the function generator’s amplitude.

Inputs and Outputs

A. TRIG Inputs - Patch a trigger or gate signal here to launch the function generator. There

are four TRIG inputs — one for each of the four function generators.

B. ENV Outputs – The function generator is output here as a unipolar 0-8v control signal.

There are four ENV outputs — one for each of the four function generators.

Page 7

Quadra & Expander Manual

Expander Front Panel

Controls

1. Attack CV Input Attenuator -

Controls the range of CV

modulation applied to the

function’s attack phase. The

range increases as the knob turns

clockwise. Generally best results

are achieved by starting at zero

and then increasing the amount

until the desired level of

modulation is discovered.

2. Decay CV Input Attenuator -

Controls the range of CV

modulation applied to the

function’s decay phase.

3. End of Cycle LED - Indicates the

completion of an envelope’s

decay phase, corresponding with

a gate signal sent out of the EOC

output.

4. Quad 1+2 Mode Switch -

Engages Quadrature Mode for

1+2. When on (switched to the

right), function 1’s end of attack

will trigger function generator 2.

5. Quad 3+4 Mode Switch -

Engages Quadrature Mode for

3+4. When on, function 3’s end of

attack will trigger function

generator 4.

Page 8

Quadra & Expander Manual

6. ENV 2 Or Amount Attenuator - Sets the level of ENV 2 into OR 1+2.

7. ENV 3 Or Amount Attenuator - Sets the level of ENV3 into OR 3+4.

8. OR 1+2 LED - Shows the state of the function generator amplitude for OR 1+2.

9. OR 3+4 LED - Shows the state of the function generator amplitude for OR 3+4.

Inputs and Outputs

A. EOC – Outputs a high gate signal when the function generator has completed its Decay

phase. The associated yellow LED [3] indicates when the respective function generator

has reached the end of its cycle.

B. Attack CV Input - Allows an input signal to modulate attack time. This input is normalled

to Decay CV Input [C], allowing both to be controlled together or separately via CV.

C. Decay CV Input - Allows an input signal to modulate decay time.

D. OR 1+2 Output - This is the mixed OR signal of 1+2. When using QUAD 1+2 mode use

this output for complex function shapes. See ADSR Envelope Generation Using the OR

Outs and Quadrature Mode more information.

E. OR 3+4 Output - This is the OR mixed signal of 3+4. When using QUAD 3+4 mode use

this output for complex function shapes.

 

Page 9

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