doepfer-a-143-2

Doepfer A-143-2 Quad ADSR

Four independent ADSRs with end-of-phase outputs, range switches, and retrigger.

26 HP Eurorack module

Doepfer's A-143-2 Quad ADSR fits four full ADSR envelope generators into a single 26 HP module. Each channel has its own Attack/Decay/Sustain/Release controls, a 3-position Range switch (low/medium/high) that selects time scaling from sub-millisecond to several minutes, a Gate input, a non-normalled Retrigger input, three digital end-of-phase outputs (EOA/EOD/EOR) for daisy-chaining and self-cycling, an envelope output (~+8 V peak), and an envelope-tracking LED. Channels 2/3/4 gates are normalled to channel 1, so a single gate at Ch1 Gate triggers all four envelopes at once when the others are unpatched.

Features

  • Four independent ADSR envelope generators in one module
  • 3-position Range switch per channel: low / medium / high time scaling
  • Attack range: ~0.3 ms to ~2 minutes
  • Decay/Release range: ~0.5 ms to ~5 minutes
  • Envelope peak ~+8 V
  • Three digital end-of-phase outputs per channel (EOA, EOD, EOR) — about +10 V high
  • Per-channel Retrigger input (not normalled) reverses envelope direction during decay
  • Channel 2/3/4 gate inputs normalled to channel 1 — one gate fires all four envelopes
  • Per-channel envelope LED display
  • Daisy-chain envelopes into ring patterns for cyclical modulation
  • Self-patch EOD → Gate to create pseudo-LFOs
  • A-100 system standard build

Controls & Jacks (48)

  • Ch1 Sustain
  • Ch1 Decay
  • Ch1 Release
  • Ch1 Attack
  • Ch2 Sustain
  • Ch2 Release
  • Ch2 Decay
  • Ch2 Attack
  • Ch3 Release
  • Ch3 Sustain
  • Ch3 Attack
  • Ch3 Decay
  • Ch4 Release
  • Ch4 Decay
  • Ch4 Attack
  • Ch4 Sustain
  • Ch1 Rt
  • Ch1 End of A
  • Ch1 End of D
  • Ch1 Gate
  • Ch1 ADSR Out
  • Ch1 End of R
  • Ch2 End of A
  • Ch2 Rt
  • Ch2 End of D
  • Ch2 ADSR Out
  • Ch2 End of R
  • Ch2 Gate
  • Ch3 Rt
  • Ch3 End of D
  • Ch3 End of A
  • Ch3 Gate
  • Ch3 End of R
  • Ch3 ADSR Out
  • Ch4 Rt
  • Ch4 End of A
  • Ch4 End of D
  • Ch4 Gate
  • Ch4 ADSR Out
  • Ch4 End of R
  • Ch1 Range
  • Ch2 Range
  • Ch3 Range
  • Ch4 Range
  • Ch1 Env LED
  • Ch2 Env LED
  • Ch3 Env LED
  • Ch4 Env LED

How-To Guides

  • One ADSR per voice (four-voice patch)
  • Self-cycling pseudo-LFO
  • Quadrature / cyclical envelope chain
  • Retriggered envelope swells
  • Drum envelopes from one gate

Explore the interactive A-143-2 Quad ADSR panel on BleepDex — tap any control to learn what it does.

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