doepfer-a-145-4

Doepfer A-145-4 Quad LFO

Four independent LFOs with waveform outputs and range switching

4 HP Eurorack module

The A-145-4 is a quad LFO module for the Doepfer A-100 Eurorack system, providing four independent low-frequency oscillators each with sine, triangle, and square wave outputs. Each LFO features a jumper-selectable frequency range for either slow modulation duties or faster audio-rate-adjacent cycling, making it a versatile and compact multi-source modulation workhorse.

Features

  • Four independent LFO channels
  • Each LFO provides sine, triangle, and square waveform outputs simultaneously
  • Per-LFO jumper-selectable frequency range: low range ~2 Hz to 0.004 Hz (4 min period) or high range ~50 Hz to 0.1 Hz (10 sec period)
  • Individual activity LED per LFO for visual monitoring of oscillation
  • Individual frequency knob per LFO
  • Jumpers JP3, JP4, JP5, JP6 control frequency range for LFO 1, 2, 3, 4 respectively
  • Compact Eurorack format providing four simultaneous modulation sources

Controls & Jacks (20)

  • LFO 1 Square Output— Square wave output of LFO 1
  • LFO 1 Frequency— Sets the frequency of LFO 1. Range depends on JP3 jumper position.
  • LFO 2 Sine Output— Sine wave output of LFO 2
  • LFO 1 Sine Output— Sine wave output of LFO 1
  • LFO 2 Frequency— Sets the frequency of LFO 2. Range depends on JP4 jumper position.
  • LFO 2 Triangle Output— Triangle wave output of LFO 2
  • LFO 2 Square Output— Square wave output of LFO 2
  • LFO 3 Frequency— Sets the frequency of LFO 3. Range depends on JP5 jumper position.
  • LFO 4 Frequency— Sets the frequency of LFO 4. Range depends on JP6 jumper position.
  • LFO 3 Sine Output— Sine wave output of LFO 3
  • LFO 1 Triangle Output— Triangle wave output of LFO 1
  • LFO 3 Triangle Output— Triangle wave output of LFO 3
  • LFO 1 Activity— Visual indicator of LFO 1 oscillation
  • LFO 2 Activity— Visual indicator of LFO 2 oscillation
  • LFO 3 Activity— Visual indicator of LFO 3 oscillation
  • LFO 3 Square Output— Square wave output of LFO 3
  • LFO 4 Sine Output— Sine wave output of LFO 4
  • LFO 4 Triangle Output— Triangle wave output of LFO 4
  • LFO 4 Square Output— Square wave output of LFO 4
  • LFO 4 Activity— Visual indicator of LFO 4 oscillation

How-To Guides

  • Slow Ambient Pad Modulation
  • Quad Tremolo Choir
  • Generative Gate Patterns
  • Independent Vibrato Per Voice
  • Automated Filter Sweep Layers
  • Pulsing Bass Modulation
  • Pseudo-Random Stepped Modulation
  • LFO-Driven Percussion Sounds

Explore the interactive A-145-4 Quad LFO panel on BleepDex — tap any control to learn what it does.

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