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Analogue  Modular  System  A-100

Width

HP

Depth

mm

Current

mA

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Owners Manual

Dual Voltage Controlled Crossfader

The A-134-2 contains two identical voltage controlled crossfader units. Each having two VCAs with opposite control behaviour. The outputs of the two VCAs are mixed together to obtain a common output. The behaviour of the control voltage inputs can be chosen with an internal jumper:

Symmetrical mode:
The VCAs of the crossfader have the same 50% amplification with zero CV. If the applied CV becomes positive the amplification of VCA1 increases and those of VCA2 decreases in the same way. A negative CV has the opposite result. The CV voltage range to obtain the maximum/minimum positions of the crossfader is about -2.5....+2.5V. This mode is useful for bidirectional  control voltages.

Asymmetrical mode:
VCA1 is fully closed and VCA2 has full 100% amplification with zero CV. If the applied CV becomes positive the amplification of VCA1 increases and those of VCA2 decreases in the same way. The CV voltage range to obtain the maximum/minimum positions of the crossfader is about 0....+5V. A negative CV has no function in this mode. This mode is useful for unidirectional (i.e. only positive) control voltages, for example ADSR, ribbon controller or Theremin control voltage.

The CV input of the upper unit (CV1) is normalled to the CV input of the lower unit (CV2). ie: if no plug is inserted to CV2 the CV input of the upper unit (CV1) also controls the lower unit.

The second signal input of the upper unit (In1B) is normalled to the first signal input of the lower unit (In2A). ie: if no plug is inserted into In2A the signal In1B is used as the first signal input of the second unit.

The inputs/outputs are DC coupled, so  the module can be used for both audio and CV signal processing.

No manual available

4

45

10HP

20

10HP

A-134.2

2

Doepfer A-134.2