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A-101.9 |
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Dual
Universal Vactrol Module |
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The
A-101.9 introduces voltage control to any function that is
controlled by a manually adjusted variable resistor (i.e. a control
with only 2 terminals used). Some examples within the A-100 are:
Attack, Decay, Release of all envelope generators (A-140, A-143.1,
A-143.2), slew time of slew limiters (A-170), delay time and
duration of trigger delay (A-162), clipping functions of the extreme
filter (A-106.1), clock rate of digital noise (A-117), random rate
and level (A-118). But even so far non-adjustable parameters that
are determined by a fixed resistor can be made voltage controlled.
The module can be used in combination with any other equipment too
that uses a variable or fixed resistor to adjust a parameter. Even
for "circuit bending" the vactrol outputs can be used.
The A-101.9 module is intended only
for users who are familiar with electronics as some soldering is
required to install the vactrol connections on the module or device
that has to be controlled by the A-101.9. If there is sufficient
space at the front panel of the module in question an additional
socket can be added. If there is not sufficient space at the front
panel a blank panel with additional socket(s) has to be mounted next
to the module. The connection between the additional socket(s) and
the vactrol output(s) of the A-101.9 is made with standard patch
cables. For external devices (e.g. effect units) the user has to
find out the solder points in question himself (a schematics of the
device will be very helpful). We have to point out that the user is
responsible for any damage that may appear at the module or device
that is modified to be connected to the vactrol output of the
A-101.9. All modifications are at your own risk! Normally the
vactrol is connected in parallel to the resistor/potentiometer that
controls the parameter in question and the potentiometer is set to
it's maximum value (e.g. 1MOhm). The dark resistance of the vactrol
is several MOhm and consequently has no or little effect to the
overall value. As the brightness increases the vactrol resistance
becomes smaller and has the same effect as operating the
potentiometer. But the potentiometer can be used also to determine
the upper value of the parameter in question if it is not set to
it's maximum value. Typical example: a 1MOhm potentiometer is used
to control the decay of an envelope generator by discharging a
capacitor to GND. The vactrol is connected in parallel to the decay
potentiometer. The setting of the potentiometer defines the maximum
decay time as the vactrol can only reduce the total resistance and
consequently reduce the decay time. The A-101.9 cannot be used (or
only with limitations) to replace a three-terminal-potentiometer
(voltage divider) as the vactrol is a two terminal element only.
Under certain conditions a three-terminal-potentiometer can be
replaced by a fixed resistor and the vactrol connected in series.
But this is possible only if the circuit is not sensitive to the
overall resistance (vactrol+fixed resistor) as this changes while
the vactrol changes it's value. One has to look at the schematics if
this is true or try it out. |
Width
8 HP |
Depth
55mm |
Current
40mA |
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Owners
manual A-101.9 |
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