Corsynth C110 2044 VCF User manual

C110 2044 VCF
USER MANUAL

C110 2044 VCF
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The C110 2044 VCF is a four pole low pass lter based in
the classical lter SSM2044. This lter chip is responsible for
the sound of some well known polysynths from the 80s like the
Korg Mono / Poly , Korg Polysix , Korg Trident, PPG Wave 2.2
and 2.3 ,EMU Emulator I, Kawai K3, Sx-240 , Siel Opera 6 ....
The C110 is designed using the new reissued SSI2144 IC. It is
an updated version of the original SSM2044 with lower noise,
better control feedthrough but preserving all the sonic
characteristics of the original design.
Like many lters the SSM2044 suer from gain loss when the
resonance is increased , the C110 includes an especially
designed circuit co correct that. This circuit can be activated or
deactivated on the front panel allowing the user to select
between the traditional response and the gain compensated
response.
The C110 has temperature compensated voltage control and it
will oscillate at high resonances. It can be used as an oscillator
over 3-4 octaves.
The C110 main characteristics are :
- Four pole response ( 24db/octave )
- Gain compensation circuit
- Three modulation inputs one with an attenuverter
- Voltage controlled resonance
- Temperature compensated
- One audio input
The FM2 input has a 0,66 V/Octave response expanding the
modulation range to 7,5 octaves using the typical 5V envelope.
C110 2044 VCF

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Cuto frequency
control
Resonance control
Resonance
modulation input
Resonance compensation
on / o switch
Frequency Modulation 2
level control
Cuto Frequency
Modulation input 2
Cuto Frequency
Modulation input 1
Audio input
Cuto frequency
1V /OCT input
C110 2044 VCF
Front Panel Description
Filter ouput

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CONTROL DESCRIPTION
FREQUENCY
This control sets the cuto frequency of the lter. The frequencies
above cuto frequency are attenuated at a rate of 24dB per
octave. When the control is set to 10 position the lter is totally
open so it doesn’t have eect over the audio frequency.
RESONANCE
This control sets the resonance level. Above 9 position the lter
will self-oscillate with a frequency dened by the frequency con-
trol. The generated waveform is a very pure sine wave that can be
used as sound source.
RESONANCE COMPENSATION SWITCH
The original 2044 lter as many other lters suer from gain loss
when the resonance is turned up. This switch activated an especia-
lly designed circuit to compensate this gain loss. In NORM posi-
tion the lter has no compensation and in the COMP position the
volume loss is compensated.
FM2
Frequency modulation input. This input has 0.66V / Octave
response getting this way a 7,5 octaves modulation range using a
5V envelope. The FM 2 LEVEL potentiometer sets the amount of
modulation. This potentiometter is a reversible attenuator, in
center position there is no modulation , to the right attenuates the
input signal and to the left attenuates an inverts the input signal.
The input allow positive and negative signals which together with
the value set by the FREQUENCY control, the FM1 and the 1V / OCT
inputs sets the nal value of the cuto frequency.

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FM 1
Frequency modulation input. The input allow positive and negati-
ve signals which together with the value set by the FREQUENCY
control, the FM2 and the 1V / OCT inputs sets the nal value of the
cuto frequency. This input has a response of 1V / octave.
1V / OCT
Frequency modulation input. The input allow positive and negati-
ve signals which together with the value set by the FREQUENCY
control, the FM1 and the FM2 inputs sets the nal value of the
cuto frequency.
RES CV
Resonance modulation input. The input allow positive and negati-
ve signals which together with the value set by the RESONANCE
control give the nal value of the resonance.
AUDIO IN
Filter input
VCF OUT
Filter ouput

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Trimmers and power connectors
Module Format : 5U, MU format ( Synthesizers.com, Moog )
Module Width : 1 MU ( Moog unit )
Module Depth :52 mm ( 2,05 inches )
Power : +15V@28mA , -15V@28mA
Power connectors : Synthesizers.com , MOTM ( 4 pin )
TECHNICAL DATA
+15V+5V-15VN/C GND
Synthesizers.com
GND +15V-15V GND
MOTM
IMPORTANT !!!!
This module has two power connec-
tors (Synthesizers.com and MOTM).
Only one is needed to power the
module. (Synthesizers.com or MOTM).
Never connect both at the
same time.
Synthesizers.com
power connector
MOTM
power connector
Oset input
Initial frequency
1V/Octv trimmer

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MODULAR LEVEL
MIN MAX
MODULAR SYNTHS