doepfer-a-150-8

Doepfer A-150-8 Octal VC Switch

Eight independent voltage-controlled signal routing switches

12 HP Eurorack module

The A-150-8 Octal VC Switch contains eight separate voltage-controlled switches, each with a control voltage input, a common Out/Input, and two In/Outputs. The switches are bi-directional, allowing one input to be routed to either of two outputs or either of two inputs to one output, making it a powerful signal router for audio, CV, and modulation sources in a modular synthesizer context.

Features

  • Eight independent voltage-controlled switches in a single module
  • Each switch is bi-directional: two inputs to one output or one input to two outputs
  • CV threshold at approximately 3.6V determines switch position
  • LED indicators for each switch show which in/output is currently active
  • Audio-frequency switching possible when CV is an audio-range signal
  • Compatible with signals in the range -8V to +8V (Version 1) or -12V to +12V (Version 2)
  • Modular signal routing for audio, CV, and modulation signals
  • Can switch between modulation sources, filter characteristics, or waveform types
  • Version 2 (from March 2004 onward) supports full A-100 voltage range -12V to +12V

Controls & Jacks (58)

  • CV 3— Control voltage input for switch 1 - determines routing (low < ~3.6V connects to I/O 1, high > ~3.6V connects to I/O 2)
  • CV 5— Control voltage input for switch 2 - determines routing (low < ~3.6V connects to I/O 1, high > ~3.6V connects to I/O 2)
  • I/O2 2— In/Output 1 for switch 2 - bidirectional signal routing
  • CV 6— In/Output 2 for switch 1 - bidirectional signal routing
  • O/I 3— In/Output 2 for switch 2 - bidirectional signal routing
  • I/O2 4— Common Out/Input for switch 2 - connects to either I/O 2a or I/O 2b based on CV input
  • I/O2 3— Control voltage input for switch 3 - determines routing (low < ~3.6V connects to I/O 1, high > ~3.6V connects to I/O 2)
  • O/I 2— In/Output 1 for switch 3 - bidirectional signal routing
  • I/O2 5— In/Output 2 for switch 3 - bidirectional signal routing
  • O/I 4— Common Out/Input for switch 3 - connects to either I/O 3a or I/O 3b based on CV input
  • O/I 5— Control voltage input for switch 4 - determines routing (low < ~3.6V connects to I/O 1, high > ~3.6V connects to I/O 2)
  • O/I 6— In/Output 1 for switch 4 - bidirectional signal routing
  • CV 4— In/Output 2 for switch 4 - bidirectional signal routing
  • I/O1 6— Common Out/Input for switch 4 - connects to either I/O 4a or I/O 4b based on CV input
  • CV 2— Control voltage input for switch 5 - determines routing (low < ~3.6V connects to I/O 1, high > ~3.6V connects to I/O 2)
  • I/O1 5— In/Output 1 for switch 5 - bidirectional signal routing
  • LED 2 L— Status indicator for switch 5 - shows which input/output is active
  • I/O1 1— In/Output 2 for switch 5 - bidirectional signal routing
  • I/O2 6— Common Out/Input for switch 5 - connects to either I/O 5a or I/O 5b based on CV input
  • I/O1 3— Control voltage input for switch 6 - determines routing (low < ~3.6V connects to I/O 1, high > ~3.6V connects to I/O 2)
  • I/O2 7— In/Output 1 for switch 1 - bidirectional signal routing
  • I/O1 2— In/Output 1 for switch 6 - bidirectional signal routing
  • I/O1 4— In/Output 2 for switch 6 - bidirectional signal routing
  • I/O1 7— Common Out/Input for switch 6 - connects to either I/O 6a or I/O 6b based on CV input
  • I/O1 8— Control voltage input for switch 7 - determines routing (low < ~3.6V connects to I/O 1, high > ~3.6V connects to I/O 2)
  • CV 1— In/Output 1 for switch 7 - bidirectional signal routing
  • CV 7— In/Output 2 for switch 7 - bidirectional signal routing
  • O/I 1— Common Out/Input for switch 7 - connects to either I/O 7a or I/O 7b based on CV input
  • LED 5 L
  • LED 8 L— Status indicator for switch 6 - shows which input/output is active
  • CV 8— Common Out/Input for switch 1 - connects to either I/O 1a or I/O 1b based on CV input
  • O/I 7— In/Output 1 for switch 8 - bidirectional signal routing
  • LED 6 L
  • I/O2 1— Common Out/Input for switch 8 - connects to either I/O 8a or I/O 8b based on CV input
  • O/I 8— Control voltage input for switch 8 - determines routing (low < ~3.6V connects to I/O 1, high > ~3.6V connects to I/O 2)
  • LED 2 S— Status indicator for switch 1 - shows which input/output is active
  • I/O2 8— In/Output 2 for switch 8 - bidirectional signal routing
  • LED 1 S
  • LED 8 S— Status indicator for switch 2 - shows which input/output is active
  • LED 7 L
  • LED 4 L— Status indicator for switch 7 - shows which input/output is active
  • LED 3 L— Status indicator for switch 8 - shows which input/output is active
  • LED 3 S— Status indicator for switch 3 - shows which input/output is active
  • LED 1 L
  • Man. 8
  • LED 7 S
  • LED 5 S
  • LED 6 S
  • LED 4 S— Status indicator for switch 4 - shows which input/output is active
  • Master/Slave
  • Toggle/Level
  • Man. 1— Manual control button for switch 1.
  • Man. 2— Manual control button for switch 2.
  • Man. 3— Manual control button for switch 3.
  • Man. 4— Manual control button for switch 4.
  • Man. 5— Manual control button for switch 5.
  • Man. 6— Manual control button for switch 6.
  • Man. 7— Manual control button for switch 7.

How-To Guides

  • Switching Filter Characteristics
  • Switching Filter Modulation Sources
  • Audio-Rate Waveform Switching
  • Sequential CV Destination Routing
  • Alternating Between Two VCO Timbres
  • Gate-Controlled Effects Bypass
  • Eight-Channel CV Source Selector
  • LFO Waveform Shape Switching

Explore the interactive A-150-8 Octal VC Switch panel on BleepDex — tap any control to learn what it does.

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