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Standard Edition
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Vintage Edition
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Module A-171-2 is a voltage
controlled slew limiter with a lot of additional features beyond a simple slew
limiter. It's mostly a licensed copy of Ken
Stones VCS which is in turn based on the Serge VCS.
These are the most important
features:
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Manual control of the Slew-Up
time
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CV control of the Slew-Up time
with polarizer
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Switch for linear/exponential
shape of the rising section of the response curve
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Manual control of the Slew-Down
time
-
CV control of the Slew-Down time
with polarizer
-
Switch for linear/exponential
shape of the falling section of the response curve
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Signal input: the "to-be-slewed"
signal
-
CV Up Input, affected by the CV
Up Control and the corresponding exp./lin. switch
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CV Down Input, affected by the
CV Down Control and the corresponding exp./lin. switch
-
CV Up and CV Down sockets are
normalled
-
exponential CV input: named
"V/Oct" in the original design but as it's not really exactly
1V/Oct we will name this input probably "exp.CV", mainly used for
VCLFO/VCO applications in cycle mode or as common exponential control for
both up and down times in slew mode
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Trigger input: used for envelope
generation or retrigger in VCLFO/VCO mode, a pulse at the trigger input will
start the envelope or retrigger the VCLFO/VCO
-
End output: turns high as the
output falls below about 20mV, turns low as the outputs goes beyond about
3.5V, in cycle mode a rectangle signal is generated
-
Cycle on/off switch: when "on"
the End output is internally connected to the Trigger Input to generate
cyclic signals like an VCLFO/VCO
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Output: the signal output of the
module
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LED display: displays the slew
limiter output signal
Typical applications:
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VC Slew Limiter / VC
Portamento / VC Low Pass Gate
Cycle switch = off, no trigger
signal applied to Trig socket:
Voltage controlled Slew limiter or portamento generator: the signal applied
to the signal input is "slewed". The slew up and down times are
controlled manually by means of the Up and Down controls, the effect of the
CV Up and CV Down control voltages are controlled by the CV Up and CV Down
controls, in exponential mode these controls also affect the slew shape (see
symbols at the CCW and CW positions of the controls)
If an audio signal is applied an short slew rates are chosen the module
works as a simple VCF/VCA combo
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A/D Envelope Generator /
Pulse Delay / Subharmonic Generator
Cycle switch = off, trigger
signal applied to Trig socket, no input signal:
Simple Attack/Decay envelope Generator, the rise and fall times are controlled like the slew
up/down times above, including the shape of the falling/rising slope of the
envelope, the exp. CV input can be used to change both attack and decay
simultaneously
At the End output a pulse appears as the end of the envelope is reached
(less than about 20mV), this can be used as a pulse delay
If a series of triggers are applied to the VCS faster than
the total rise and fall times, the module will divide the incoming signal by
a whole number. In the audio range the output will be the sub-harmonic
series.
-
VCLFO / VCO
Cycle switch = on, no trigger
signal applied to Trig socket, no input signal:
Voltage controlled LFO/VCO, the rise and fall times of the waveform are
controlled like the slew up/down times above, including the shape of the
falling/rising slope
the exp. CV input can be used like the CV input of a VCO or VCLFO, the
response is exponential but not exactly 1V/oct
A more detailed description of the module
will follow soon. Until then the explanation on Ken Stone's website Ken
Stones VCS can be used as a preliminary information.
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