flightofharmony » Eurorack Infernal Noise Machine

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» Eurorack Infernal Noise Machine

Status: Discontinued.

Type
- Sound source/Oscillator
- CV & Signal processor
Format
- Eurorack
Width
- 48hp/243mm/9.6”
Power
- 16-pin (2×8) Doepfer standard eurorack shrouded header
- User-selectable +5V supply
  - System bus
  - Onboard regulated supply
Included
- Module
- 9” 16-pin to 10-pin & 16-pin power cable
- (4) M3x6 mounting screws
- (4) nylon washers
- user manual

Functional Features
- IMP noise core audio source, generated by the nonlinear heterodyning of a pair of oscillators. The IMP has eight frequency regions (Domains) of operation, from semi-random sub-audio impulses to above audio range, used as the primary frequency modulation (FM) source for the VCO. The output is also available to each signal chain as well as an independent output jack.
  
  Frequency of oscillation is controlled by Coarse and Fine joysticks with multiple Control Voltage (CV) inputs and other controls. The joysticks have breaking input jacks for controlling external signals, and non-breaking output jacks to allow the signal to be used externally as well as control the IMP.
- Voltage-Controlled Oscillator (VCO) with Square, Ramp, Saw, Triangle, and Sine, waveforms available to each signal chain along with independent output jacks for each waveform. The VCO has two user-selectable ranges, 1 Volt per Octave (1V/Oct) covering ~4Hz to above 20kHz and Low-Frequency Oscillator (LFO) covering ~400Hz down to ~0.06Hz (~16 seconds per cycle).
  
  The VCO can be modulated by the internal IMP noise core or by external modulation sources, and the modulation amount (depth) of either can be controlled by dial and CV.
- 2 Audio signal chains consisting of a Voltage-Controlled Filter (VCF) (bypassable) and a Voltage-controlled Amplifier (VCA), each with breaking inputs and outputs (I/O). These I/O allow the VCF and VCA to be used independently or as inserts to the signal chain to allow external effects to be added. The two VCA outputs can also be used to provide stereo imaging and effects.
  
  The VCF are Voltage-Controlled Bandpass Filters (VCBPF). Filter band width and Gain are varied by the Gain control and the filter’s Center Frequency is varied by the fc control and can also be voltage-controlled.
- The VCF In/Out bypass switches remove the filters from the signal chain to pass the raw modulated VCO signal to the VCA.
- The VCAs have ±5V “soft-knee” output limiting protection for external modules. Instead of hard clipping, which squares-off the peaks of the signal, the soft-knee performs a gradual limiting of the signal as it approaches ±5V.
- Summed output of VCA 1 & VCA 2 available at the All Out jack, via the Volume control.

Design Features
- Lifetime warranty against defects in assembly
- Components on one side of PCB for easier serviceability
- Modular build to allow simpler repair or replacement of hardware
- All trimming potentiometers accessible without disassembly
- Pin-to-signal identification on PCB silkscreen to aid servicing
- No electrolytic capacitors in signal path or power circuitry

Sections
- VCF1&2
  - Controls
    - CV
      - Center Frequency CV input attenuator
    - fc
      - Center Frequency
    - Gain
      - Gain level
    - VCO
      - VCO source waveform selector (bypassed by using Ext In Jack)
        
        Square
        
        Ramp
        
        Saw
        
        Triangle
        
        Sine
        
        Noise
  - Selector switches (In VCA section)
    - In/Out
      - Have VCF either In or Out of VCF →VCA signal chain (Bypass)
  - Inputs
    - fc CV
      - VCF center frequency
      - Buffered
    - Ext In
      - External signal input
        
        AC-coupled
        
        Breaking
  - Outputs
    - Ext Out
      - AC-coupled
      - Breaking
- IMP noise core
  - Controls
    - Frequency & Range Joysticks
      - Coarse
      - Fine
    - Domain rotary switch
      - Select frequency band of IMP noise core
      - 1-8, lowest → highest
    - Tone
      - Low-pass filter to remove harshness in higher domains
    - Frequency
      - Width
        
        width of Frequency band affected
      - Frequency CV input attenuator
    - Range
      - Range CV input attenuator
      - Width
        
        width of Range band affected
  - Inputs
    - CV, 0 → +5V
      - Over- and under-voltage protection
      - Frequency and Range CV (buffered)
      - Coarse Frequency and Range (Joystick)
      - Fine Frequency and Range (Joystick)
      - Frequency and Range Width (no attenuator)
  - Outputs
    - CV, 0 → +5V
      - Coarse Frequency and Range
        
        Joystick, buffered, non-breaking
      - Fine Frequency and Range
        
        Joystick, buffered, non-breaking
    - Signal, ±5V
      - Noise out
      - ±5V soft-clip limited
- VCO
  - Controls
    - CV
      - VCO frequency CV attenuator
    - Ext
      - External VCO modulation signal input attenuator
    - Tune
      - VCO frequency
    - Mod Depth
      - Depth mod signal affects VCO
    - VCO toggle switch
      - Set VCO to either 1V/octave audio range or LFO
    - Mod Src toggle switch
      - Select either Internal or External VCO modulation source
  - Inputs
    - CV
      - VCO frequency
    - Ext
      - External modulation source
    - AC-coupled
      - ±5V soft-clip limited
    - Mod CV
      - VCO Modulation Depth
  - Outputs, ±5V
    - Square
    - Ramp
    - Saw
    - Triangle
    - Sine
- VCA 1&2
  - Controls
    - Level
    - CV
      - VCA output level CV input attenuator
  - Inputs
    - CV
      - VCA level
      - Buffered
  - In
    - External signal input
      - Breaking
  - Outputs
    - Out
      - Signal out
        
        ±5V soft-clip limited
        
        Non-breaking
  - Averaged Output
    - Control
      - Volume
    - Output, ±5V
      - All Out
        
        Averaged output of VCA1 & VCA2
        
        ±5V soft-clip limited from VCAs

Modified on June 14th, 2023
Posted by Flight