doepfer-a-118-2

Doepfer A-118-2 Noise / Random

White, colored noise and wandering random voltage generator

4 HP Eurorack module

The A-118 Noise/Random is a noise and random voltage generator that produces white noise, colored noise, and a continuously varying random voltage. It is a foundational modular utility for creating organic textures, wind effects, generative melodies, and unpredictable control voltages with musical character ranging from harsh digital chaos to slow drifting randomness.

Features

  • White noise output with flat frequency spectrum
  • Colored noise output with mixable Red (low frequency) and Blue (high frequency) components
  • Random voltage output derived from colored noise via low pass filtering
  • Rate knob controls cycle time of random voltage from fast (pink noise-like) to slow
  • Level knob controls amplitude of random voltage output
  • Two LEDs (Random Control + and -) indicate polarity and amplitude of random voltage
  • Blue and Red knob settings affect both the colored output and the random voltage output
  • Random voltage can optionally be derived from white noise output via internal modification

Controls & Jacks (12)

  • White— White noise output containing all audio frequencies at random amplitude
  • Red— Control for red noise component (low frequency components) in colored noise output
  • Level— Control for amplitude of random voltage output
  • Blue— Control for blue noise component (high frequency components) in colored noise output
  • TH/SH
  • Rate— Control for cycle time of random voltage; 0 means fast changes (pink-like spectrum), 10 means slow changes
  • Random Output— Random voltage output whose rate of change and amplitude are determined by Rate and Level controls
  • RND
  • Colored— Colored noise output whose spectrum is determined by Blue and Red control positions
  • Clk
  • Random Control +— LED indicator showing positive state of random voltage with relative brightness indicating amplitude
  • Random Control— LED indicator showing positive state of random voltage with relative brightness indicating amplitude

How-To Guides

  • Organic Wind Sound
  • Generative Random Arpeggios
  • White Noise Percussion Source
  • Slow Drifting Random CV
  • Pink-Like Noise for Audio Texture Layers
  • Fast Chaotic Modulation Source
  • Manual Spectral Noise Sculpting
  • Random Panning and Spatial Movement

Explore the interactive A-118-2 Noise / Random panel on BleepDex — tap any control to learn what it does.

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