video upload by WMDevices
"Announcing the MKIII version of the WMD Digital VCA eurorack module. This new and improved dual VCA and Polarizer (bipolar VCA) has a zero-crossing detector and noise source. At only 8HP, this module can do many cool things for any modular synth in a small space."
WMD Digital VCA MKIII - In Depth Demo
video upload by WMDevices
"WMD is back and finally in production with the new Digital VCA MKIII eurorack module. This modern take on a classic WMD design combines a Zero Crossing Detector (ZCD), a Voltage Controlled Attenuator (VCA), and a couple noise sources to make a super versatile tool at only 8HP. Watch as Alex Anderson explains many of the features and use cases.
00:00 Overview
00:54 White Noise Explanation
02:16 VCA overview
04:55 Remove clicks and pops the ZCD
07:59 Trigger Mode
14:06 Amplitude modulation and the Bipolar functions
18:51 Normaling of 'B' inputs with Dual VCA patch example
20:56 Mixing capabilities
23:00 ZCD Outputs"
via WMD
"I've done several designs of this circuit over the years, the first one had no knobs, the second was too small, the MKIII is finally how this circuit should be packaged. This module does some really cool stuff and is super useful in any system.
The Digital VCA lets signal through like a normal VCA, but the CV and attenuation level is controlled digitally. This lets us do things like wait until there is a zero crossing to change the amplitude, resulting in clickless amplitude changes.
The Trigger mode causes the VCA to only update when a trigger is received. The addition of a noise circuit for each side let us do a very quick and easy sample and hold that never droops. With no input, 5V is normaled to the attenuator, so you get a 0-5V sample and hold. In Bipolar mode, you can get -5 to +5V.
Both sides have bipolar VCA mode (polarizer), which lets them invert the signal when negative CV comes in. Also known as ring modulation. With the zero crossing detector, this can produce some super wild wave shapes.
Limited run of 410 units for Eurorack Modular Synthesizer systems. I won't be making more or doing another version in the future."
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