Description Input expansion for the PDO & stand alone 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. 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 PDO EXPANSION CONNECTION GUIDE 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. Specs: Power: +12V = 80mA; -12V = 75mA Size: 8HP Depth: 25mm Every WMD product is warranted for 12 months after purchase, but please contact us if you ever have problems. We will take care of you.
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