Quad VCA Quad Voltage Controlled Amplifier and Cascaded Mixer Manual (English) Revision: 2021.08.
TABLE OF CONTENTS COMPLIANCE 2 INSTALLATION 3 Installing Your Module 3 OVERVIEW 5 Features 5 FRONT PANEL 6 Controls 6 Inputs and Outputs 7 INSTRUCTIONS 8 4 Independent VCAs 8 Level Bias 8 Cascaded CV 9 Cascaded Mixing 9 Combinations 9 TECHNICAL SPECIFICATIONS 10 Quad VCA Manual 1
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.
INSTALLATION 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.
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.
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.
FRONT PANEL 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.
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.
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: 1. 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. 2. Connect OUT 1 to the input of the destination. 3. Connect a modulating signal to CV 1.
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: 1. Connect two different oscillator outputs or other sound sources to IN 1 and IN 2. 2. Connect a CV source such as an envelope to CV 1. 3. Take output from OUT 2, or also OUT 1 if going for further parallel processing. 4.
TECHNICAL SPECIFICATIONS Width 12 hp Maximum Depth 29 mm Current Draw 65 mA @ +12 V 65 mA @ -12 V Quad VCA Manual 10
