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ELEX K2 (Hohner Stringvox) (r3) K2-20-2 Modulation Board: Schematic
R10 120R
R12 2K7
R4 1K0
R2 1K
Component codes are added arbitrarily in the absence of original documentation.
Resistors are ±5% and
R5
560R
⁄
W
1
2
C2
C3
C4
47
1m0
100
35V
25V
63V
R6
15K
Q1
R7 100K
R3 18K
+27
audio
1
⁄
W except where stated. All diodes are BA130. All Transistors are BC558A.
4
design c.1975–79 ELEX S.p.A. (Excelsior) | drawn 2024 electropict
R14 10K
D1
R17
R18
150R
5K6
1
⁄
W
2
Q2
D4
C7
560p
R13
R19
120R
39K
⁄
W
1
2
R9
390R
1
⁄
W
2
C5
10n
R8 22K
R1
10K
C1
220n
GND
D2
R20
R22
150R
5K6
1
⁄
W
2
D5
C11
560p
R23
R21
120R
39K
1
⁄
2
1
8
IC1
TCA
R24
350Z
390R
⁄
1
2
4
5
R11
22K
C8
1 0
R15
22K
C9
C10
1 0
10n
R16
150K
C6
470p
audio
D3
R25
Q3
680R
1
⁄
W
2
C13
220n
W
W
C14
220
35V
C12
100n
GND
modulation
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