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Doepfer A-150

Dual VCSThe A-150 (Dual VCS) module contains two separate voltage-controlled switches. Each switch has a control input, a common output / input and 2 inputs / outputs. The switches are bi-directional, i.e. Both switching directions are possible. Voltages in the range of -8V ... + 8V can be processed at the I / O or O / I connections. The common output / input is connected to one of the two inputs / outputs in accordance with the applied control voltage.

  • 2 Independent VCS circuits
  • Bi-directional usage
  • 2 LEDs as an indicator of I / O1 and I / O2
  • Power requirements: 30 mA (12V) / -10 mA (-12V)
  • Width: 4 TE / 20.0 mm
  • Depth: 30 mm (measured from the rear of the front plate)

Further information

Module Yes
Empty Rack, Or Housing No
Basic System No
Accessories No
6 customer ratings:
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5 / 5.0
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1 written ratings
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A simple and affordable module with countless uses

Zoë, 07.03.2014
This small, unassuming module is useful for all sorts of things. The trick is to think as laterally as possible, which is always good advice when using a modular synthesiser.

When feeding it a slow gate, such as the accent from a TB-303 style step sequencer, you can make certain notes have quirky features. For example, most notes can go through a filter's low-pass mode, while accented ones go through its high-pass mode. Or most notes can be square waves while the accented ones are sawtooth waves.

But the distinction between a control voltage and an audio signal is arbitrary. Audible, even tuned square waves can be thought of as very fast gates. So using an oscillator's square wave output, you can alternate between waveforms and filter types and anything else you can imagine so fast that you can play a melody on the alternation itself, making bizarre new waveforms in the process.

Indeed, using nothing more than an A-110 and an A-150, you can create waveforms that are, say, sawtooth for the first part of the cycle and triangle for the second part, with the pulsewidth dictating when the switch occurs. That's pretty West Coast for such an ostensibly East Coast synthesiser.

I'd recommend this module to anyone who likes thinking laterally, as it can add new dimensions to even the simplest of other modules.
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