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A-134.2 |
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Dual
Voltage Controlled Crossfader |
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The
A-134-2 contains two identical voltage controlled crossfader units.
Each unit has two voltage controlled amplifiers (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:
If the corresponding jumper is not set both 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 (i.e. positive and negative) control voltages, for
example LFO or joy stick (adjusted to 0V CV in center position).
Asymmetrical mode:
If the corresponding jumper is set 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.
As the inputs and outputs are DC coupled the module can be used for
both audio and control voltage signal processing. |
Width
4 HP |
Depth
45mm |
Current
20 mA |
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Owners
manual coming soon |
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