DUAL STATE
VARIABLE VCF
User’s Manual
Eurorack Synthesizer Modules
26 HP
TABLE OF CONTENTS
1.INTRODUCTION
2.WARRANTY
3.INSTALLATION
4.FUNCTION OF PANEL COMPONENTS
5.CHARACTERISTICS
6.SPECIFICATIONS
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1. INTRODUCTION
Audiophile Circuits League. -DUAL STATE VARIABLE VCF module contains two
12dB multimode VCF´s A and B, with Lowpass, Bandpass, Highpass and
Notch-Output. Both �ilters A and B can be controlled individually and
simultaneously in the same time. Filters can be routed in parallel or serial
con�iguration. All Audio and CV-inputs are normalized from �ilter A→B. CV
inputs for Cutoff and Resonance of each �ilter got a attenuverter.
(For details about normalization, see section 5. CHARACTERISTICS)
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2. WARRANTY
Is it a malfunction?
In the event of a fault in use, we will repair or replace it free of charge under the
warranty terms stated below. The warranty period is valid for one year from the
Please read the user's manual carefully and check again. If you think that there is
day of purchase. If repair is necessary, please ask the dealer you purchased it
still a problem, please consult the dealer you purchased from or contact us
from.
(English) .
We can not guarantee the incidental damage caused by the breakdown or
[email protected]
damage that occurred during use of this product. In addition, warranty will
expire in the following cases:
· Failure / damage caused by use of unspeci�ied power supply / accessories.
· Failure / damage caused by incorrect connection or use of power cable.
· Failure / damage caused by improper handling method.
· Failure / damage caused by natural disasters (�ire, �looding etc.) and
pollution.
· When the cause of breakdown or damage lies in equipment other than this
product.
· Failure / damage caused by improper modi�ication, adjustment, parts
replacement.
· Failure / damage when used under particularly severe conditions, when
loaned/rental/hired out to 3rd party.
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3. INSTALLATION
⚠WARNING
*Always turn the Eurorack unit off and unplug the power cord before pluging
GATE
the Eurorack power cable.
CV
*When attaching the Eurorack power cable, please be careful not to touch the
+5V
terminal part.
+12V
GND
Connect to the Eurorack's system power supply (+ 12V) using the supplied
GND
Eurorack power cable.
Connect the 16-pin connector to the Eurorack power connector. Connect the red
mark on the power cable so that it matches the pin on the (- 12 V) side of the
power connector.
To Module
Connect the 10 pin connector to the shrouded header on the back of the module.
The header is protected against reverse-plugging.
FIG.1:Eurorack power cable
5
Red line
GND
To Power
Connector
-12V
4. FUNCTION OF PANEL COMPONENTS
① "RES" knob
1
Adjust the depth of the �ilter resonance.
2
② "CUTOFF" knob
Adjust the �ilter cutoff frequency.
7
4
3
5
③ "CV RES" knob
8
It is an attenuverter that adjusts the strength of the signal input from the
⑪"RES CV" jack in the plus / minus direction.
6
④ "CV CUTOFF" knob
9
12
10
14
14
It is an attenuverter that adjusts the strength of the signal input from the
⑩"FILTER CV" jack in the plus / minus direction.
11
14
14
13
⑤ "IN A" knob
This is an attenuator that adjusts the strength of the audio signal input from
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⑬"IN A" .
⑥ "LP HP" knob
FIG.2:Front Panel
In the serial mode, the audio signal proceeds with �ilter A → B, but the signal
received by �ilter B from �ilter A can be gradually changed from LowPass to
Notch to HighPass by this knob (See FIG.3).
In both the parallel and serial mode, it is also possible to gradually change the
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audio signal output from the "NOTCH" jack from LP to Notch to HP (See FIG.4).
LP
HP
LP
HP
LP
HP
LP
HP
LP
HP
Low Pass
LP
Notch
Low Pass Audio
Signal comes out
HP
LP
HP
LP
HP
Notch Audio
Signal comes out
NOTCH Output jack
High Pass Audio
Signal comes out
FIG.4: Changing audio output signal from "Notch" jack by "LP HP"
knob setting
High Pass
⑦ "CUTOFF A/B" knob
CUTOFF of both �ilters A and B can be adjusted together by one knob. For
example, the position where the knob is fully opened in the clockwise direction
is de�ined as "0". Assume that the value of each parameter is
FIG.3: Filter type change by "LP HP" knob setting
DUAL CUTOFF = "0", CUTOFF A = "- 1", CUTOFF B = "- 2".
Then, if you set DUAL CUTOFF to "-2", it changes in conjunction with
CUTOFF A = "-3" and CUTOFF B = "- 4"
(See FIG.5).
When using �ilters A and B in stereo, you can simultaneously control the left and
right channels with one CUTOFF A/B knob.
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A
DUAL
0
-2
-3
-2
-4
-1
⑩ "CUT OFF" CV input jack
It is a CV input for cutoff. The "CV CUTOFF" knob functions as an attenuverter
B
that adjusts the strength of the signal input from this jack in the plus / minus
direction.
⑪ "RES" CV input jack
It is CV input for resonance. The "CV RES" knob functions as an attenuverter that
adjusts the strength of the signal input from this jack in the plus / minus
direction.
FIG.5: Reaction of CUTOFF A, B in conjunction with the operation of
DUAL CUTOFF
⑫ "1V/OCT" input jack
This �ilter can also be used as a substitute for the oscillator by self-oscillation. At
that time, you can use this input jack to attach the scale. For a method of
*Besides CUTOFF A and B, the knob itself does not actually rotate according to
substituting as an oscillator.
the movement of DUAL CUTOFF.
⑬ "IN A" "IN B" input jacks
⑧ "PAR-SER" selector
Input the audio signal for processing with �ilters A and B.
Switch the functions of �ilters A and B to parallel or serial mode. In parallel
mode, �ilters A and B can be used independently. In the serial mode, the audio
⑭ "LP" "NOTCH" "HP" "BP" output jacks
signal goes from A to B. However, even when using the serial mode, it is also
It outputs the �iltered audio signal. Since all jacks can output simultaneously. So
possible to output audio on the �ilter A side, so �lexible patching is possible.
variety of patching is enabled. As mentioned above, only the "NOTCH" output
jack has a special function, so you can use it by switching the �ilter type output
⑨ "BP-LP/HP/NOTCH" selector
by "LP HP" knob (See FIG.4).
When using the serial mode, select and switch the �ilter type of the audio signal
to �ilter A → B. When "BP" is selected, the audio signal going from A to B, that is,
the audio signal received from A by �ilter B becomes band pass. On the other
hand, if you select "LP / HP / NOTCH", the audio signal received by �ilter B is
speci�ied by the position of the ⑥ "LP HP" knob as explained in the ⑥ "LP HP"
knob section.
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5. CHARACTERISTIC
All audio / CV input signals are normalized (internally connected) from �ilter A
Conversely, when inputs A and B are performed using two patch cables, it is
to �ilter B. "Normalization" means that audio / CV signals are automatically
possible to control and process �ilters A and B independently (See FIG. 7).
duplicated from �ilter A to �ilter B when no cable is inserted on �ilter B side. In
other words, both A and B �ilters can be controlled and processed from one cable
input (See FIG.6). This feature economizes the need to duplicate signals using
external multiple modules.
Input jack A & B (Audio & CV)
Input jack A (Audio & CV)
A
Filter A
Filter B
B
Filter A
FIG.6: When only input A is plugged in (Normalized)
Filter B
FIG.7: When inputs A and B are plugged in (not Normalized)
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6. SPECIFICATIONS
Power
Eurorack system power supply
Width
26 HP
Depth
22 mm
Power consumption
Ca. 50 mA on - 12 V / ca. 53 mA on + 12 V
Accessories
· Eurorack power cable x1
· Mounting screws x4
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ACL-E-VCF-1709-1
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