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E
MKB1 CIRCUIT
+5V
CN3
C4
C1
+5
1
6.3V47
0.1
2
E
3
KF0
4
KS0
5
KF1
KS1
6
7
KF2
TO
8
KS2
MAIN
9
KB3
CN4
10
KF3
KS3
11
12
KB2
13
KB1
14
KB0
15
KB4
E
16
UNLESS OTHERWISE SPECIFIED:
DIODES ARE MA165.
+5
IC1
HD74LS138P
1
16
A0
+VCC
(3 TO 8 DECODER)
2
15
A1
0
3
14
A2
1
4
13
CS2
2
5
CS3
Y
3
12
6
11
CS1
4
7
10
7 Y
5
8
9
GND
6
C6
0.1
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