VCA
AJH Synth MiniMod VCA Silver

Regular Price: $269

$242

This product is currently discontinued.

Availability Low Stock

Discrete Cascaded VCA Module
VCA_SILVER
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Description

The MiniMod Discrete Cascaded VCA is a 10hp wide Eurorack format module. It features two fully discrete transistor VCA cores which are hardwired in series.

There are two audio inputs each with their own level controls along with two CV inputs which control the gain of VCA 1 and a Master CV input and level control which controls the gain of VCA 2. There is also an offset control so that a preset gain can be added to VCA 1. Internally it operates at the same voltage and signal levels as the early Model D voltage controlled amplifier and the output of VCA 1 is hardwired to the input of VCA 2.

A high gain (overdrive) mode can be selected for VCA 1 with an onboard jumper, this overdrives it into soft clipping and in this mode the second VCA can be used in a similar way to the Master volume on a guitar amplifier so that variable levels of distortion (or "grit") can be added to the sound.

The original Model D synthesiser had not one, but two VCA’s. Both VCA’s were fully discrete transistor differential amplifier designs using matched transistors and they were hard wired in series. The output level of the first VCA was controlled by the Control Voltage from the Loudness Contour generator, whereas the level of the second VCA was set by the Control Voltage from the external pedal. If the pedal was not present then it was normalised to full volume, so without the pedal input the second VCA preset to maximum (unity) gain.

In order to keep as closely as possible to the original sound and functionality the MiniMod VCA cores operate at the same internal supply voltages as the Model D, this is generated from two onboard low ripple voltage regulators which drop the +/- 12v Eurorack power supply rails to the correct +/-10V internal voltages. It connects to a standard Eurorack power bus using the supplied 10 way to 16 way header cable.

 

Technical Specifications

  • Module Width: 10hp
  • Module Depth: 26mm
  • Current Usage: 40mA Positive, 22mA Negative

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