Intellijel Quad VCA Manual de usuario

Quad VCA Manual v1.00

Quad VCA

Quad Voltage Controlled Amplifier and Cascaded Mixer

Quad VCA Manual v1.00

Table of Contents

Table of Contents

Overview

Features

Installation

Before Your Start

Installing Your Module

Front Panel

Controls

Inputs and Outputs

Instructions

4 Independent VCAs

Level Bias

Cascaded CV

Cascaded Mixing

Technical Specifications

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Quad VCA Manual v1.00

Overview

The Intellijel Quad VCA is a versatile four channel variable response VCA. It features cascaded

CV inputs and cascaded mix outputs allowing it to be used in a number of versatile

configurations. A boost switch provides additional amplification for low level signals or a subtle

overdrive for audio. More than just simply four VCAs, the Quad VCA is bound to be useful in

any patch.

Features

●Manual LEVEL control per VCA which is convenient when using the module as a mixer

or for biasing when CV modulating the VCA with a bipolar LFO.

●Dedicated CV attenuators with dual color LEDs for monitoring bipolar CV signals.

●Continuously adjustable response from linear to exponential per VCA.

●Each CV input is normalled to the adjacent one for cascaded control.

●Each output is normalled to the mix input of the adjacent one which allows you to use

adjacent sets as submixes or the fourth output can be used as a master mix output when

none of the other outputs are patched.

●Each VCA has a BOOST switch that increases the output level by approximately +6dB

(double).

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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.

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.

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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.

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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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Quad VCA Manual v1.00

Front Panel

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Quad VCA Manual v1.00

Controls

1. CV Attenuator - Controls the amount of CV modulation sent to control a channel’s level.

Because the CV inputs cascade, if there is no CV input on a channel, but a preceding

channel has a CV input, this knob will bring up that previous channel’s CV signal.

2. CV LED - Each of the four channels has a red/green LED whose intensity shows the

post-attenuator level of the incoming CV signal. It lights green for positive voltages and

red for negative.

3. Linear / Exponential Response - This attenuator controls the response of the channel’s

VCA to the LEVEL knob and CV input. When fully counterclockwise the response of the

channel’s VCA is exponential. When turned fully clockwise the response is linear.

In-between settings provide a variable response between the two extremes.

4. BOOST - When this switch is set to the left position (disabled) the maximum linear gain

of the channel’s VCA when the LEVEL knob is fully clockwise or +5 V is applied to the

CV input is approximately unity (1:1). When set to the right position (enabled) the signal

is boosted by around +6 dB (2:1).

5. LEVEL 1 - Sets the base level, or bias, of the channel’s VCA. When fully clockwise this

approximately equivalent to applying a +5 V voltage at the CV input. In the fully linear

response this results in unity (1:1) gain. The knob level is summed with the channel’s CV

input.

6. LEVEL 2 - Sets the base level of channel 2.

7. LEVEL 3 - Sets the base level of channel 3.

8. LEVEL 4  - Sets the base level of channel 4.

Inputs and Outputs

A. CV 1 - The CV input for controlling the level of channel 1. A +5 V input with the channel’s

attenuator fully clockwise, response knob fully linear, and LEVEL control fully

counterclockwise results in approximately unity (1:1) gain.

B. CV 2 - The CV input for controlling the level of channel 2. If nothing is connected to this

jack, the CV is taken from CV 1.

C. CV 3 - The CV input for controlling the level of channel 3. If nothing is connected to this

jack, the CV is taken from CV 2.

D. CV 4 - The CV input for controlling the level of channel 4. If nothing is connected to this

jack, the CV is taken from CV 3.

E. IN 1 - The input to channel 1.

F. IN 2 - The input to channel 2.

G. IN 3 - The input to channel 3.

H. IN 4 - The input to channel 4.

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Quad VCA Manual v1.00

I. OUT 1 - The signal output for channel 1. If nothing is connected to this jack the output is

mixed into OUT 2.

J. OUT 2 - The signal output for channel 2. If nothing is connected to this jack the output is

mixed into OUT 3.

K. OUT 3 - The signal output for channel 3. If nothing is connected to this jack the output is

mixed into OUT 4.

L. OUT 4/MIX - The signal output for channel 4. If the other three OUT jacks are left

unconnected, this jack can function as the output of a 4-channel mix.

 

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Quad VCA Manual v1.00

Instructions

4 Independent VCAs

The simplest way to use the Quad VCA is to ignore any of the cascading CV and mixing

functionality and just use it as four independent VCAs:

● Connect the output signal from the source to IN 1. The source can be anything, any

oscillator, LFO, envelope, or any other audio or CV generator.

● Connect OUT 1 to the input of the destination.

● Connect a modulating signal to CV 1. The modulating signal can also be anything but is

typically the output of an envelope generator or LFO. Interesting effects can be had

when using audio-rate sources like oscillators.

● Turn LEVEL 1 fully counterclockwise to remove any CV bias.

● Adjust the CV input attenuator and Linear / Exponential Response control to taste.

You can repeat the above instructions for channels 2, 3, and 4 to get four totally separate VCAs.

Level Bias

The LEVEL control of each channel can be used bias the channel’s response. In this way you

can set the “default” amount of signal passing through the VCA, and then adjust it using external

CV. One situation where this is useful is when controlling amounts of modulation. For example

when the output of one oscillator is being connected to the FM input of another the Quad VCA

can be used to vary the FM amount:

● Connect the sine output of oscillator 1 (the modulator) to IN 1 of the Quad VCA.

● Connect OUT 1 of the Quad VCA to the FM input of oscillator 2 (the carrier).

● Use LEVEL 1 to set the FM amount (index).

● Connect an envelope to CV 1 and adjust the attenuator. The envelope can now be used

to vary the FM index during each note played.

Cascaded CV

The Quad VCA features cascading CV, meaning that one CV input can be used to control more

than one channel. If a channel’s CV input is left unconnected then the channel will respond to

CV from the previous channel, subject to its own CV attenuation level:

Page 9

Otros manuales para Quad VCA

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Intellijel

Intellijel Dual VCA 1U Manual de usuario

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