Instruction Manual

IN 2
2/3 CV1V/Oct
IN 3IN 1
INPUT 1
FREQ CV EMP CV
INPUT 2 INPUT 3
EMPHASIS
FREQ-CV OUT
EMP-CV1/3 CV
-2
-4 4
2
TRANSISTOR LADDER FILTER
mod
2
8
4
6
0
10
2
8
4
6
0
10
2
8
4
6
0
10
2
8
4
6
0
10
2
8
4
6
0
10
2
8
4
6
0
10
FREQ
7 Cuto Freq.
9 Freq. CV Level
4 Input 1 Level
11 1/3 CV Input
10 1V/Oct Input
8 Freq. CV Input
1 Audio Input 1
Emph. CV Level 15
2 Audio Input 2
Input 2 Level 5
Input 3 Level 6
2/3 CV Input 12
Emp. CV Input 14
Audio Output 16
Audio Input 3 3
Emphasis Level 13
1 Audio Input 1 :
Audio Input 1 forms part of a 3 input audio mixer which is attached to the front end of the
lter. This Input is mixed with Input 2 and Input 3 at a level set by Audio 1 Level control
(4). Typically the output from a VCO would be connected to this Input, but any AC signal
with a level of up to +/- 5 Volts is acceptable. .
All three Audio Inputs are for audio signals only, the lter signal path is AC coupled so DC
control voltages are not useful here but will not cause any problem if accidentally
connected.
2 Audio Input 2 :
Audio Input 2 forms part of a 3 input audio mixer which is attached to the front end of the
lter. This input is mixed with Input 1 and Input 3 at a level set by Audio 2 Level control
(5). Signal levels of up to +/- 5 Volts are acceptable.
3 Audio Input 3 :
Audio Input 3 forms part of a 3 input audio mixer which is attached to the front end of the
lter. This input is mixed with Input 1 and Input 2 at a level set by Audio 3 Level control
(6). Signal levels of up to +/- 5 Volts are acceptable.
4 Input 1 Level :
Sets the amount of signal from Audio Input 1 (between 0% and 100%) that is mixed with
Audio Inputs 2 & 3 and sent to the lter core.
5 Input 2 Level :
Sets the amount of signal from Audio Input 2 (between 0% and 100%) that is mixed with
Audio Inputs 1 & 3 and sent to the lter core.
6 Input 3 Level :
Sets the amount of signal from Audio Input 3 (between 0% and 100%) that is mixed with
Audio Inputs 1 & 2 and sent to the lter core.
Controls, Inputs and Outputs
7 Cuto Freq. :
The Cuto Frequency control manually varies the cut o frequency of the low pass
lter. At the minimum setting (fully counter clockwise) the lter will cut o all frequencies
with no audio output and at the maximum setting the lter will pass all frequencies. It is
still active when using CV control, in which case it acts as an oset control.
(Audio)
(Audio)
(Audio)