ajh-synth/minimod-vca
MiniMod Discrete Cascaded VCA
A Eurorack VCA module with two fully discrete transistor VCA cores wired in series, modeled after the dual-VCA topology of the Moog Model D. Audio inputs and CV inputs control VCA 1; a Master CV input controls VCA 2, which is auto-normalized to full open when unpatched. An onboard jumper selects a high-gain overdrive mode for VCA 1.1017
Capabilities 1
- Voltage-Controlled Amplifiervca
- Two discrete transistor VCA cores in series with linear CV response; AC-coupled (audio signals only). Master CV auto-normalized to +10V when unpatched, keeping VCA 2 fully open by default.1017
Jacks 6 (5 in / 1 out)
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (5) | |||
| Audio 1 | audio | — | First audio input summed into VCA 1; level set by the Audio 1 Level knob. AC-coupled; audio signals only.1017 |
| Audio 2 | audio | — | Second audio input summed into VCA 1 alongside Audio 1; level set by the Audio 2 Level knob. AC-coupled; audio signals only.1017 |
| CV 1 | cv | — | First CV input controlling the gain of VCA 1 with linear response.1017 |
| CV 2 | cv | — | Second CV input also controlling the gain of VCA 1; summed with CV 1.1017 |
| Master CV | cv | ≤10V | Controls the gain of VCA 2; auto-normalized to +10V when unpatched, keeping VCA 2 fully open by default (mirroring the external pedal normalization of the original Model D). Attenuation of the incoming signal is set by the Master CV Level knob.1017 |
| Outputs (1) | |||
| Audio Output | audio | — | Single audio output from the end of the cascaded VCA chain (VCA 2 output). AC-coupled.1017 |
Parameters 4
| Name | Type | Range | Behavior |
|---|---|---|---|
| Audio 1 Level | knob | — | Sets the input level of the Audio 1 signal into VCA 1. Turning to maximum increases distortion in overdrive mode.1017 |
| Audio 2 Level | knob | — | Sets the input level of the Audio 2 signal into VCA 1. Turning to maximum increases distortion in overdrive mode.1017 |
| Master CV Level | knob | — | Attenuates the Master CV signal before it drives VCA 2's gain. When Master CV is unpatched, this knob acts as a manual master volume control (with the internal +10V normalization driving VCA 2).1017 |
| Offset | knob | — | Adds a manual bias/preset gain to VCA 1 independently of the CV inputs. Also affects distortion level in overdrive mode.1017 |
Firmware history 0 versions
No firmware history recorded.
References 1
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[1017]
AJH Synth MiniMod Discrete Cascaded VCA product/manual pageproduct_page● verified 2026-05-28