10.
Circuit Diagrams and PWB Layouts
Keyboard control
J1
1
2
3
4
4 HEADER
V
SS
1
C1
2
C2
VOL-
R7
470?
VOL+
R
8
5.6k?
S
OURCE
R
3
2.2k?
CH-
R4
470?
CH+
R5
5.6k?
ON/OFF
R6
0?
V
SS
104
V
SS
V
SS
V
SS
104
C7
104
V
SS
7
C
8
104
V
SS
8
C
3
104
V
SS
3
C4
104
V
SS
4
C5
104
V
SS
5
C6
104
V
SS
6
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
8
250_55
8
_090210.ep
s
090410
Key
b
o
a
rd control
E