MATRIXSYNTH: New Barton Musical Circuits BMC093 Diode Shaper VCA & BMC092 Sample Release

Wednesday, November 30, 2022

New Barton Musical Circuits BMC093 Diode Shaper VCA & BMC092 Sample Release

BMC093 Diode Shaper VCA Demovideo upload by boogdish

"Demonstration/Overview of a new synthesizer module design.
I provide PCBs/Panels for DIY builders and also sell pre-built modules on my site. Visit to get more information on this module. PCBs and fully built modules can be ordered from:"

This module is a VCA that uses rectified feedback/feedforward to provide waveshaping. Both the feedback/forward knobs can provide positive or negative feedback and the external CV control is an attenuverter. It also includes switchable Zener diode limiters to soften the output when large amounts of positive feedback are used. The module is DC coupled, so it can be used with LFOs, Envelopes and CV sources as well waveforms. The DC coupling also allows for DC offset to be applied to the input which increases harmonic possibilities.
This module is designed for 12V systems, but works with 15V systems with just one resistor change. The documentation gives tips on how to tweak or modify the circuit.

BMC092. Sample Release Demo video upload by boogdish

"This is a demo/overview of a new synthesizer module design. More information (schematics, ordering, etc) can be found at"

The Sample Release is a 4 channel bipolar envelope generator module that can also act as a sample-and-hold or track-and-hold. Each channel takes a voltage input, samples it and then that voltage goes to zero volts with it's rate controlled by the release knob. This generates control envelopes that fall when positive voltage inputs are applied and rise when negative voltage inputs are applied. Each channel has a toggle that disables the release function and lets the channel act as a traditional sample-and-hold or track-and-hold. Additionally, a +5V supply is normalized to the voltage input so the module can also be used as a normal release generator

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