VCA360
Dual channel linear VCA based around CEM/AS3360, 4HP
I/O:
– CV input per channel
– signal input per channel
– signal output per channel
Controls:
– Bias (sets the initial level of amplifier)
– CV amount (sets the amount of attenuation for CV inputs)
[ BOM ] [ SCHEMATIC ] [ PCB ]
MIX123
Triple channel audio/CV mixer/attenuverter, 4HP. Through-hole redesign of Mutable Instruments Shades, without LEDs and configurable constant voltage (fixed to +5V).
I/O:
– signal input per channel
– signal output per channel
Controls:
– Function switch (attenuverter/attenuator)
– Gain
BUCKET
MN3007 based 8HP module for chorus/flanger, (really) short echos, reverberation effects… and much more. Feedback can be pushed beyond self-oscillation.
I/O:
– IN (audio input)
– OUT (audio output)
– WET (wet output, delayed signal only)
– t (time CV input)
– FB (feedback CV input)
– MIX (mix CV input)
Controls:
– Drive (adjusts the level of input signal)
– Time (adjusts delay time)
– Range switch (sets the range of delay time, mid/short/long)
– Feedback (adjusts the level of delayed signal that is fed back to the input of BBD)
– Polarity switch (sets the polarity of delayed signal)
– Tone (adjusts the tone of delayed signal [also affects the level of feedback], CCW increases lows and cuts treble, CW it does the opposite)
– Mix (adjusts the ratio of dry and wet signal, ranges from 100% dry to almost 100% wet)
– Time CV amount (attenuates CV connected to “t” input)
[ BOM ] [ SCHEMATIC ] [ MODIFICATION ] [ PCB ]
KRYSA
Distortion/overdrive module inspired by guitar pedals utilizing diode clipping, 4HP.
I/O:
– IN (audio input)
– OUT (audio output)
– drive CV input
Controls:
– drive (adjusts the amount of distortion)
– tone (adjusts the tone of output, CCW increases lows and cuts treble, CW it does the reverse)
– diode switch (diode clipping off/on)
– input attenuator (sets the level of signal connected to input, for modular levels it should be kept low)
– drive CV attenuator
[ BOM ] [ SCHEMATIC ] [ PCB ]
INPUT
Monophonic input module, amplifier for non-modular level signals (guitar, microphone, music player devices, etc.), with built in envelope follower and gate detector, 4HP.
I/O:
– INPUT (audio input, 6.3mm jack)
– AMP (amplified audio output)
– E (envelope follower output)
– G (gate detector output)
Controls:
– level/AMP (adjusts the amplification of incoming signal, affects the response of “E” and “G” outputs)
– RESP switch (sets the overall response of the envelope follower, slow/fast)
– FALL switch (sets the fall/release time of the envelope follower, slow/fast)
– THRESHOLD (sets the level that the incoming audio must exceed for the module to generate a gate signal, the gate outputs behavior depends a lot on the envelope followers output)
[ BOM ] [ SCHEMATIC ] [ PCB ]
FUMO
Five Unit Modular System
My most ambitious project ever (thanks covid). The goal was to create a low-cost, 5U modular system, using FR4 panels and easy to assemble PCBs. The “format” uses classic Moog modular panel dimensions, Dotcom power standards (MTA-100) and mostly adapted circuits from all over the world.
0021 Voltage Controlled Low Pass Filter (link)
0024 Fixed Filter Bank (link)
0025 Lowpass Gate (208-ish LPG)
0028 Dual Voltage Controlled Amplifier (link)
0030 VCO Core Board
0031 Complex Voltage Controlled Oscillator (link)
0032 Voltage Controlled Oscillator
0042 Twin Envelope Generator
0047 Signal Processor (link)
0048 Signal Mixer (CP3)
0049 Signal Router (link)
Some schematics, PCB renders and design mockups are available [ here ]