Doepfer A-150-8 Octal Manual / Voltage Controlled Programmable Switches

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Net price: €121.85

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Each channel of the A-150-8 features a push-button and a CV input for controlling the built-in... more
Product information "Doepfer A-150-8 Octal Manual / Voltage Controlled Programmable Switches"

The A-150-8 comes equipped with eight bi-directional switching channels, which can be controlled manually or via control voltages. Each channel features a main connector called O/I. It is wired with either socket I/O 1 or I/O 2, depending on the state of the switch. Thanks to the module’s bidirectional design, the musician can decide which connector(s) are used as input(s) and output(s). Several channels are linkable in master / slave configurations.

Each channel of the A-150-8 features a push-button and a CV input for controlling the built-in switch. Furthermore, there are three connectors per channel (O/I, I/O 1, I/O 2). Two basic types of usage can be distinguished:

  • One signal is fed to the channel via the O/I socket. Depending on the switching state, signals are routed to either I/O 1 or I/O 2.
  • Two signals are fed to the channel via the connectors I/O 1 and I/O 2. Depending on the switching state, one or the other signal is routed to the O/I socket.

Users can choose between two modes of operation:

Toggle mode: The state of the switch is changed by pressing the push-button or a rising edge at the CV input.

Level mode: The state of the switch is changed by the level of incoming control voltages (< +1.5 V = I/O 1; > +3.5 V = I/O 2). The push-button works differently in this mode as well: As long as the button is pressed, I/O 2 is used. If the button is not pressed, I/O 1 is used.)

Several channels can be linked via master / slave groups.

Please note: The O/I lines feature protection resistors. This can lead to small voltage drops, which in most cases can be neglected. Exception: Pitch control voltages for oscillators. If you experience any problems, please us an active multiple like the A-180-3 as a buffer circuit.

HE: 3
TE: 12
Depth: 61
Power consumption +12V: 40
Power consumption -12V: 5
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"Doepfer A-150-8 Octal Manual / Voltage Controlled Programmable Switches"
A-150-8 @Doepfer
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Doepfer Musikelektronik GmbH

WIth a long trajectory building synths, MIDI keyboards and designing bespoke devices for music pioneers Kraftwerk, Dieter Doepfer decided to design his own modular synthesizer in 1995 based on existing electrical and mechanical specifications of lab equipment he used during his years at university. The official presentation of the system at 1996 Frankfurt Musikmesse caught everyone by surprise and created lots of interest. After Doepfer published the specifications on his website, many instrument designers and engineers saw the potential of the new Eurorack format. Doepfer continues expanding their catalog of over 200 modules (and counting), operating from their modest offices in the outskirts of Munich.

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