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ELEX K2 (Hohner Stringvox) (r3) K2-13 Controls Board: Schematic
Piano
Harpsichord
Bass
(bass)
(bass)
audio
audio
audio
K2-10
K2-10
K2-9
K2-110
K2-110
K2-9
pin 5
pin 4
pin 7
pin 22
pin 23
pin 9
GND
GND
1
2
3
2
2
4
5
2
2
6
7
VR1
VR2
VR3
100K
100K
100K
BASS
PIANO
HARPSICHORD
Component codes are assigned arbitrarily
in the absence of original documentation.
Pin codes are as on the K2-14 board.
All fixed resistors are ±5%.
VOLUME
Cello
Strings
(bass)
(bass)
audio
audio
K2-110
K2-110
pin 1
pin 6
GND
8
2
2
2
9
VR4
VR5
10K
10K
Q1
CELLO
STRINGS
C1
4n7
R3
R5
8K2
47K
R1
R2
82K
27K
grounding
switches
cello
cello
strings
strings
on K2-110
(treble)
(bass)
(bass)
(treble)
decay
decay
decay
decay
GND
GND
+27
10
11
2
12
13
14
15
16
2
17
18
CELLO
STRINGS
Q2
Q4
VR6
2×
10K
R6
R4
R10
R8
47K
8K2
8K2
47K
DECAY
Piano
Harpsichord
(treble)
(treble)
audio
K2-110
K2-9
K2-9
pin 28
pin 4
pin 3
GND
19
20
2
2
21
VR8
VR9
Q3
100K
100K
VR7
2×
PIANO
HARPSI-
10K
CHORD
R7
R9
47K
8K2
(Treble volumes apply to all keys in 'Full' mode.)
designed c.1976 ELEX S.p.A. (Excelsior)
drawn 2024 electropict
Cello
Strings
(treble)
(treble)
all strings
audio
audio
audio
audio
K2-110
K2-110
K2-110
pin 26
pin 4
pin 8
GND
GND
22
23
2
24
2
2
25
VR10
VR11
10K
10K
CELLO
STRINGS
C2
2n2
R11
R12
82K
27K
VOLUME
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