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Triple Bipolar VCA

Intoducing the WMD Triple Bipolar VCA, the input side expansion for our Phase Displacement Oscillator. This module provides dedicated inverting/polarizing/bipolar amplitude modulating inputs normaled to the Phase Modulation inputs on the PDO.

A bipolar VCA is like a normal VCA when operated with positive control voltage. But when using a negative control voltage, the output will swing back through zero amplitude and the output will be inverted. This produces deeper modulation than a normal VCA.

The Triple Bipolar VCA is also designed to be used as a standalone module, it does not require the PDO to operate.

Controls and I/O

+ In – This is the normal input for each VCA channel. It drives the inverting side of the Bipolar VCA. These inputs are normaled from outputs on the PDO.

– In – This is the second input for the VCA channel. Normaled through this jack is the inverted signal from the + Input. Plugging in here converts the channel from a Bipolar VCA to a dual VCA. Negative control voltages will open the – side, and positive control voltages will open the + side. This allows you to use two modulation sources and alternate between them, while still retaining control over amplitude.

CV – This input jack drives the CV knob. It can handle unipolar or bipolar signals.

Out – This is the output of each VCA channel. They are normaled to the Phase Modulation inputs on the PDO.

Bias Knob – Sets the manual gain for the VCA. Centered will have a zero output (with 0V control voltage).

CV Knob – This knob is a bipolar attenuator for the signal applied to the CV jack. Spin clockwise from center for positive CV interactions, counterclockwise to invert the CV.

Mix Out – This output jack mixes the signals from each VCA.

Specification:

  • Three Bipolar VCAs
  • Normaling to PDO
  • Linear Response
  • Bipolar Attenuator for CV
  • Mix Output Sums All Three VCAs
  • Bi-color Signal LEDs
  • “-” Input for Mix Through Zero
  • Module depth: 25mm (Skiffable PCB Design)
  • Current Consumption:+80mA/-75mA
  • Panel size: 8 HP

Other modules by WMD | Geiger Counter | Gamma Wave Source | Synchrodyne | Phase Displacement Oscillator (PDO) Mk II | Quad Anti Aliasing Filter (QAAF) | Micro Hadron Collider | uHC audio expander | uHC CV expander | Multimode VCA | Multimode Envelope | Multimode Envelope Expansion | Invert Offset MkII | Synchrodyne Expand | Compressor | Digital VCA | Buffered Mult | Performance Mixer | PM Channels | PM Mutes