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Dual VCA (2VCA)

from $20.00 
DESCRIPTION

A pair of clean, low-noise VCAs perfect for shaping signals anywhere in your patch. With a smooth exponential response tailored for envelopes, excellent CV rejection, and a natural audio taper, the Dual VCA delivers precise control and quiet operation. Compact, reliable, and ideal for internal level control or dynamic modulation.

DETAILS

  • DIY PCB

  • Current: TBD

  • PCB Size: 6” x 1”

SELECT PRODUCT: 
DESCRIPTION

A pair of clean, low-noise VCAs perfect for shaping signals anywhere in your patch. With a smooth exponential response tailored for envelopes, excellent CV rejection, and a natural audio taper, the Dual VCA delivers precise control and quiet operation. Compact, reliable, and ideal for internal level control or dynamic modulation.

DETAILS

  • DIY PCB

  • Current: TBD

  • PCB Size: 6” x 1”

Dual VCA (2VCA)
Based around the original Serge 2VCA and updated with precision-matched SMD transistors, this module offers two clean, low-noise voltage controlled amplifiers for compact utility use throughout a system. Rather than serving as output mixers, these VCAs excel at patch-level control and internal routing. Each channel features an exponential (audio taper) response with 12 dB per volt sensitivity across its range. Below about 0.5V, the output rapidly attenuates to silence, perfect for envelope control and exceptionally quiet operation. With excellent CV rejection, a smooth exponential curve, and a maximum gain of 2 without distortion or overload, the Dual VCA delivers reliable and musical signal shaping anywhere in your patch.

From the original catalog:
”The DUAL VCA (2VCA) employs two high-quality VCAs. This module is an excellent inter-patch VCA, featuring very low noise and exponential response. It was designed as a small VCA function for use at various places within a system for internal VCA functions (as opposed to the VCAs for output mixing). Like the new Universal Audio Processor and the Cross-Fader this VCA has an audio taper that is an exponential curve with a 12 dB per volt sensitivity throughout the range except below about .5 volts. Below this threshold, the output of the VCA will decrease rapidly to completely attenuate the signal. This response is perfect for our envelope voltage range, and is responsible for exceptionally quiet operation. Control voltage rejection is very high, and the unit can't be overdriven beyond a gain factor of two.”


Build Notes / Calibration:
Coming soon
Jumper C12/C14 for DC Coupling

LGE214 Dual VCA (2VCA) DIY Build Documentation:

Main Board
LGE214 Main PCB Bill of Materials
LGE214 Main PCB Schematic
LGE214 Main PCB Layout w/ Designators

I/O Board
LGE214C I/O Board PCB Bill of Materials
LGE214C I/O Board PCB Schematic (wiring diagram)
LGE214C I/O Board PCB Layout w/ Designators
Mechanical Parts BOM generally required for building Low-Gain Electronics Modules

** 4U Modular is a term used for the format most commonly known as “Serge Format” or “Loudest Warning Format”. Out of respect for the ever growing format, 4U Modular is the easiest way to refer to it. More Specifically it refers to the panel height and mounting hole style. 4U Modular will patch up just fine with other 4U "Serge" formats such as "Random Source", but it will not mount in RS boats or Buchla Boats (or power off Buchla power for that matter). An info page about this will be added to the website soon to make this a lot more easy to understand.

Details:

  • PCB Size: 6” x 1”

  • Current Draw: TBD