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WMDevices Triple Bipolar VCA

Module providing dedicated inverting/polarizing/bipolar amplitude modulating inputs normaled to the Phase Modulation inputs on the PDO

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Our Price: $229.00

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Product Description
Additional Information
  • Product Description

    The WMDevices Triple Bipolar VCA is an input side expansion for the 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.


    • 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
    • Skiffable PCB Design
    • 8 HP
    • +80mA/-75mA Current Consumption
  • Additional Information

    Condition New
    Maximum Depth 25 mm
    Chassis module
    Module Slot Count 8hp
    Connector Type 3.5mm
    Power Consumption +80 mA/-75 mA
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  • View FileWMDevices - Triple Bipolar VCA Manual (2.11 MB)