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Crowminius Analog Music Synthesizer

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    Description
    The Crowminius is a desktop analog monophonic music synthesizer built in the spirit of Dr. Moog's famous Model D!

    The Crowminius is a complete desktop monophonic analog music synthesizer inspired by Dr. Robert Moog's legendary Minimoog model D. The Crowminius is constructed from standard components with no esoteric parts and is fitted into a sleek aluminum attache case for easy portability.

    The Crowminius features three full-range 100% analog oscillators (tone generators) that each can be set via rotary switches from sub-sonic frequencies through a set of "organ stops" (octaves) from 32' (bass) to 2' (high soprano). Each oscillator has six waveforms also set by rotary switch to provide the harmonic spectra used to create various sounds.

    Oscillators 1 and 2 each feature individual pulse-width modulation generators--a feature not found on the vintage model D--and oscillator 3 can be set to act as a "control oscillator" to provide vibrato and filter modulation by use of the on-board modulation control or by MIDI modulation commands from a remote controller.

    The Crowminius has an on-board white/pink/red noise generator that can be used to create audio effects such as wind and surf sounds, but the noise source can also be used as a modulation source. Another feature included on Crowminius that makes use of the noise generator is a "sample/hold" circuit that uses oscillator 3 in control mode as a clock to trap the noise signal levels and provide a series of stepped random modulation voltages.

    These signals are all presented to the 4-pole ladder filter and control amplifer, an all-discrete transistor (no chips!) circuit combination that defined the sound of 1970s progressive rock. The filter has dedicated controls for tracking and modulation, and the filter and amplifier each have their own contour generators to control the dynamics of your sound.

    The Crowminius also features an Atmel MIDI control front-end based on the ATMEGA328P chip, the same as used in the popular Arduino Uno. The open-source firmware supports MIDI note, velocity and aftertouch as well as MIDI pitch and mod wheel support. An optional LCD can be installed to monitor system functions but it is not necessary. In the case of interfacing with vintage pre-MIDI gear such as the classic Minimoog, modular synthesizers and modern instruments that offer the necessary control signals, the unit can be operated from pitch control voltage and choice of voltage trigger or switch trigger jacks.

    Other features include an external audio input into the filter, a "locking" portamento/glide circuit for moving from note to note in solo style, and a "decay mute" feature which allows immediate muting of notes when keys are released. Both the glide and decay mute functions can be operated by external footswitches if needed.

    Finally, two essential performance features are provided. A reference tone at A-440 ("concert A") can be enabled for precise instrument tuning. This tone is created by the microcontroller using a direct-digital synthesis algorithm that outputs a very accurate PWM-modulated sine tone. Secondly, a dedicated headphone jack and headphone volume control allow the performer to mute the instrument, set up a new voice patch, tune up and and un-mute right back into a live session without disrupting the performance.

    The entire Crowminius system is powered from a single 12VAC, 500mA wall-pack power supply, with provision to allow the use of two supplies for improved supply operation.
    Images
    Architecture
    Type: Analog
    Synthesis: Subtractive
    Oscillators
    Oscillators: 3
    Waveforms: Pink Noise, Pulse Variable, Saw Up, Square, Triangle, White Noise
    Osc Modulation: Envelope, Input, Oscillator
    Envelopes
    Envelopes: 2
    Evelope Paramerters: Attack, Decay, Sustain, Release
    Filters
    Filters: 1
    Types: 24dB Slope (4-pole), Low Pass, Resonance
    Filter Modulation: Envelope, Input
    Filter Notes:
    + ladder filter
    Polyphony & Tuning
    Polyphony: 1
    Timbrality: 1
    Tuning: Standard
    Modes: Mono
    Case
    Case: Desktop, Module
    Controls: Knobs, Switches
    Display Type: LED
    Connections
    Audio Output Connections: 1/4" Phone Jack, Mono Out
    MIDI Ports: IN, OUT
    CV Ports: CV IN, CV OUT
    Production
    Year Released: 2017
    Manuals & Documents

    Product Links
    Company Product Sites:
    [+] www.crowmini.us
    [+] www.kickstarter.com
    Pricing
    MSRP List Price: $1,200 - convert
    Shopping
    YouTube Videos
    Related Synthesizers
    Minimoog (1971)
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