Majella audio VVCA User manual
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VVCA USER MANUAL
Version 1.0
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VELOCITY CONTROLLED VCA (VVCA)
User Manual
©2018 Majella Audio
2
INTRODUCTION
The VVCA is a fully analog dual voltage
controlled amplifier (VCA). The unique part
of this VCA is the velocity input, which
makes it possible to modulate the
incoming CV signal with a velocity voltage
(or any other CV source). The VVCA is a
linear dual VCA and can be used for both
CV and audio signals. It is a straightforward
4HP module that adds velocity, and a whole
new dimension to your modular setup!
FUNCTIONAL DIAGRAM
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CONTENT
In the box of the assembled version of the
VVCA contains the. following
•Tested and Assembled VVCa Module
•16pin to 16 pin ribbon cable
•Mounting hardware: two M3 screws
If anything of the above is missing. Please
contact your dealer or support@majella-
audio.com
SPECIFICATIONS
•Dimensions: 128.5 x 20 x 2mm
•Doepfer A-100 Eurorack compatible
(16 pin power connector, uses the 5V
rail!)
•Power consumption: +/-12V (15mA),
,5V (10mA)
POWER CONNECTION
This module is designed to be connected to
your Eurorack system, using a 16-pin
ribboncable. The -12V (red stripe) should be
directed as shown in the picture below.
WARNING!
This module is designed for Eurorack
systems. The supply should be +-12V and
connected signals should not be out of the
+-12V range! Do not reverse polarity when
connecting the power, this will damage
your module permanently!
VELOCITY CONTROLLED VCA (VVCA)
User Manual
©2018 Majella Audio
3
CONNTECTIONS
1. OUTPUT
The output of the VVCA has the same
amplitude as the input when the velocity is
5V and the CV signal is 8V. The VVCA adds a
tiny bit of “soft clipping” to the input signal,
which we find “characteristic”.
2. INPUT
The VVCA is designed to process 5V
amplitude signals (common VCO outputs),
but can also be used for DC signals (CV
sources etc.).
3. VELOCITY
The velocity input is designed to use with 0-
5V velocity control voltages, but other types
of CV sources can also be connected to
modulate the incoming CV signal (4).
4. CV INPUT
The CV input is designed for 0-8V control
voltages, which is a common ADSR
envelope output range.
VELOCITY CONTROLLED VCA (VVCA)
User Manual
©2018 Majella Audio
4
VVCA User Manual
version 1.0 9-09-2018
©2018
https://majella-audio.com
support@majella-audio.com
Designed and made in Holland
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