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.
