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ELEX K2 (Hohner Stringvox) (r3) K2-3 Contacts Board: Schematic
key numbers
1
2
3
4
5
6
7
8
9
10
F
1
F
1
G
1
A
1
A
1
B
1
B
1
C
1
C
1
D
1
strings bass
62
busbar (+20)
ensemble
busbar (+20) 63
strings oct. 1
terminals
strings
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
wired to
K2-2 (bass)
pianos
1b
2b
3b
4b
5b
6b
7b
8b
9b
10b
11b
(Ensemble Mode)
oct. 2
oct. 3
The K2 is a 61-key keyboard with a 24/37 split.
The pianos contacts move from the negatively
connect the busbars' positive voltage to the K2-1
ensemble busbar. The additional circuitry on
K2-1 boards for those keys send their normal
Each key operates two or three contact springs
charged off busbar to the grounded on busbar.
strings circuit.
K2-3 (including the extra wires between ⓐ
strings audio signals even though they have not
and has an individual K2-1 voicing card on the
The speed at which they change contact controls
Normally each key controls only one K2-1
terminals) transmits gate signals for keys 1–24
been triggered directly.
K2-2 board, to which the contacts are individually
the volume of the pianos note played
(though not
card. However, in Ensemble mode, power is
(F1–E2) to the K2-1 boards two and three
wired through their ⓐ and ⓑ solder terminals.
. The strings contacts
switched from the strings treble busbar to the
octaves above the key pressed (F3–E5), so the
very effectively, really)
bass range
11
12
13
14
15
16
17
18
19
20
21
22
23
E
1
E
1
F
2
F
2
G
2
A
2
A
2
B
2
B
2
C
2
C
2
D
2
E
2
12a
13a
14a
15a
16a
17a
18a
19a
20a
21a
22a
23a
12b
13b
14b
15b
16b
17b
18b
19b
20b
21b
22b
23b
oct. 2
oct. 3
49a
50a
51a
52a
53a
54a
55a
56a
57a
58a
59a
24
25
26
27
28
29
30
31
32
33
34
35
E
2
F
3
F
3
G
3
A
3
A
3
B
3
B
3
C
3
C
3
D
3
E
3
24a
25a
26a
27a
28a
29a
30a
31a
32a
33a
34a
35a
36a
24b
25b
26b
27b
28b
29b
30b
31b
32b
33b
34b
35b
60a
treble range
36
37
38
39
40
41
42
43
44
45
46
47
48
E
3
F
4
F
4
G
4
A
4
A
4
B
4
B
4
C
4
C
4
D
4
E
4
E
4
37a
38a
39a
40a
41a
42a
43a
44a
45a
46a
47a
48a
36b
37b
38b
39b
40b
41b
42b
43b
44b
45b
46b
47b
48b
49
50
51
52
53
54
55
56
57
58
59
60
F
5
F
5
G
5
A
5
A
5
B
5
B
5
C
5
C
5
D
5
E
5
E
5
49a
50a
51a
52a
53a
54a
55a
56a
57a
58a
59a
60a
61a
49b
50b
51b
52b
53b
54b
55b
56b
57b
58b
59b
60b
Terminal numbering is as on the board.
designed c.1975 ELEX S.p.A. (Excelsior)
drawn 2024 electropict
61
F6
strings treble
64
busbar (+20)
pianos-off
65
busbar (–26)
66
pianos-on
busbar (GND)
470n
strings
terminals
wired to
61b
pianos
K2-2 (treble)
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