Modular
4. Adjustment
2
3
4
5 6
7
8 9
21
10
11
13 14
15 16
17
18 19
20
22
12
Objekt in Pfade:
4
4
14
Falsche Zahlen
4
1V/Octave Adjustment
The VCO is already carefully adjusted to 1V/Oct. If you
realize that the XR22 VCO FT isn't in tune with your
other analog synthesizer equipment, it may be
necessary to adjust it.
Procedure
(Suggestion):
1.
Switch on your equipment and the XR22 VCO
FT and wait 1/4 hour until the oscillator have
the right temperature.
2.
Put range switch in right position 'Mid'.
Adjust F1 & F2 knobs & to ≈ middle
position (≈ 3 - 5 on scale)
3.
Connect a CV from a keyboard (or a similar CV
source) both to your favorite VCO's 1V/oct.
input and to the XR22 VCO F1/com 1V/oct.
input . Put switch "com" and switch "FSK"
2
3
4
5 6
7
8 9
21
10
11
13 14
15 16
17
18 19
20
22
12
Objekt in Pfade:
4
4
14
Falsche Zahlen
in upper position ("F1").
4.
Play a note on your keyboard in the middle
range, e.g. "c", or "c1". The note should be
nearby to the tone you have adjusted on the XR22.
5.
Adjust pot "F1" and fine tuning until the pitch of the XR22 is the same like that of the 2
nd
VCO.
6.
Play a note ≈ 2 - 3 octaves higher. Adjust trimmer "F1 1V/oct" (see above) until the XR22 VCO is
tracking to the 2
nd
VCO.
7.
Go back to step "4" and repeat all other steps until both oscillators are in tune.
8.
Repeat the same procedure with "F2" (with "FSK"
2
3
4
5 6
7
8 9
21
10
11
13 14
15 16
17
18 19
20
22
12
Objekt in Pfade:
4
4
14
Falsche Zahlen
in middle position and F2 1V/Oct. Input ).
Alternatively, you can use the 1V/Oct input F1/com for F2, too. Put switch 'com' in lower
position and the 1V/Oct input F1/com is now working for both FSK frequencies. Put FSK
switch
2
3
4
5 6
7
8 9
21
10
11
13 14
15 16
17
18 19
20
22
12
Objekt in Pfade:
4
4
14
Falsche Zahlen
in middle position 'F2'. Adjust coarse poti F2 and fine tuning until both
frequencies are in tune.
9.
Compare F1 and F2 by switching the FSK switch
2
3
4
5 6
7
8 9
21
10
11
13 14
15 16
17
18 19
20
22
12
Objekt in Pfade:
4
4
14
Falsche Zahlen
from one frequency to the other; repeat the
tuning and adjustment steps 1.- 8. until both frequencies are perfectly matching and in tune
with the external keyboard/VCO.
Bus CV
•
Jumper "JP1" in "on" position (on PCB): The Bus CV is controlling the XR22 VCO's frequencies.
•
Jumper "JP1" in "off" position (on PCB): The Bus CV is not connected.
6
2
3
4
5 6
7
8 9
21
10
11
13 14
15 16
17
18 19
20
22
12
Objekt in Pfade:
4
4
14
Falsche Zahlen
4
F1 1V/oct.
Adjustment
F2 1V/oct.
Adjustment
Potentiometer
'Gain'
0-point
Bus CV on/off
Output
Offset
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