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A-185.2 |
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Precision
Adder |
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The
A-185.2 is a precision control voltage adder/buffer. Precision means
that the amplification of the inputs without attenuators is exactly
1.00 and is suitable to add control voltages for the pitch control
of VCOs (e.g. from keyboard + sequencer 1 + sequencer 2). High
tolerence summing resistors are matched to obtain an accuracy of
0.1% for the added voltages.
The module is equipped with four CV inputs: one with attenuator and
three without attenuator. Each input is normalised to +1 V (i.e. if
no plug is inserted the input contributes 1 V to the sum appearing
at the output). The input with attenuator can be used for common
modulations (e.g. from an LFO, ADSR, Theremin, Pitch-Bender) for all
VCOs connected to the output. The inputs without attenuators are for
adding control voltages coming out of keyboards, sequencers,
Midi-to-CV interfaces, ribbon controllers or other CV sources that
follow the 1V/oct standard. For example the CV of a keyboard can be
used to transpose the CV coming from a sequencer, or the CV of a
slow sequencer can be used to transpose the CV from a fast
sequencer.
Each input is equipped with a three-position switch that determines
if the corresponding voltage is added (right position), subtracted
(left position) or if the input has no effect (center position). If
no plug is inserted the corresponding switch works as an octave
switch as the default 1 V are added or subtracted to the output
voltage according to the switch position.
The module is equipped with 4 outputs: three non-invertíng
and one inverting ouput. An internal jumper can be used to connect
the non-inverted or inverted output to the CV line of the A-100 bus.
That way the module can used to control several VCOs that are
connected to the same bus board as the A-185-2 (same functionality
as A-185-1).
Note: There is a pin header with three pins (labelled JP5) near the
bus cable connector. If no jumper is installed there is no
connection between the outputs of the A-185.2 and the CV line of the
A-100 bus. In the lower position the normal CV output of the A-185.2
is connected to the CV line of the A-100 bus. In the upper position
the inverted CV output of the A-185.2 is connected to the CV line of
the A-100 bus. |
Width
6 HP |
Depth
50mm |
Current
10 mA |
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Owners
manual coming soon |
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