Mosaic DUAL LINEAR VCA User manual
DUAL LINEAR VCA
Manual
THINGS TO KNOW
What is 1U? 1U is a measurement of height in the 19” rackmount stan-
dard. Eurorack modules adhere to 3 rack units, or 3U. Mo-
saic tiles adhere to 1 rack unit in height, and require appro-
priate rails to mount in a rack or modular case.
What 1U
format are
Mosaic
modules?
We ship our modules with Intellijel 1U formatted front pan-
els. If you use the Pulp Logic format, don’t worry! You can
purchase Pulp Logic replacement front panels on our Re-
placement Panels page.
Mosaic
Color
Guide
Each color indicates a function across the Mosaic lineup.
Green: Audio Signals
Purple: Gate Signals
Blue: Control Voltage
1
OVERVIEW
Description
Attenuate and amplify your signals with the Dual Linear VCA. This all-analog dual VCA gives you
control over audio and modulation signals with an offset knob per channel and LED level indica-
tors. As the old adage says, you can never have too many VCA’s!
• Dual Linear Analog VCA
• SSI-2164 topology
• Offset knob per channel
• DC Coupled - Great for audio or CV signals
• LED level indicators
• When no signal is present in either channel, 10V is sent to each channel for DC voltage control
Tech Specs
• Width: 14HP
• 38mm
• Front Panel: Ships in Intellijel format. Pulp Logic replacement panels available here.
• Current Consumption: +12V = 21mA, -12V = 26mA
Installation
To install, locate space in your Eurorack case for your 1U module, and confirm the positive 12 volts
and negative 12 volts sides of the power distribution lines. Plug the connector into the power distri-
bution board of your case, keeping in mind that the red band corresponds to negative 12 volts. In
most systems, the negative 12 volt supply line is at the bottom. The power cable should be connect-
ed to the module with the red band facing the front of the module.
2
DETAILS
How It Works
A
voltage controlled amplifier (or VCA) is an amplifier whose gain is controlled by voltage. By
adjusting the control voltage input, you can change the amplitude of the signal passing through
the VCA. If you are sending audio through your VCA, you now have the ability to adjust the ampli-
tude, or volume, of said audio via external control voltage (CV) or an onboard potentiometer.
The Dual Linear VCA is composed of two VCA channels, allowing you to control the amplitude of
two signals simultaneously and independently. Since the channels are DC-coupled, they can be
used for CV signals as well as audio. Plug a signal into the left side of the channel, and out of the
right side, then turn the channel knob to get started!
Diagram
1 2 3 4 5
3
DETAILS
1. Signal Input
Signal input jacks for channels 1 and 2. Channels are DC coupled, and accept both Audio and
CV signals. When no signal is present in either jack, 10V is normalled to the inputs, allowing each
channel to be used to output DC voltage without any additional patching.
2. CV Input Jack
CV input jacks for channels 1 and 2.
Range: +10V
3. Amplitude Potentiometer
Amplitude knobs for channels 1 and 2. Each knob is parallel with its respective channel. The am-
plitude is at 0V when the knob is fully counter clockwise, and 10v/2x gain when the knob is fully
clockwise.
When a patch cable is present in the CV jack, the channel’s potentiometer becomes the offset for
the CV. For example, if you were to patch an envelope into the VCA, the knob will determine the
starting point for your CV level.
Range: +10V
4. Amplitude LED
Visual indicator of the amplitude’s voltage level.
5. Signal Output
Signal outputs for channels 1 and 2. When no signal is present in either input, both outputs send
DC voltage without any additional patching.
Range: 10Vpp
4
For more information, visit www.mosaic1u.com
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