Page 107 - The Addams Family (Williams)

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Switch Matrix Circuit
COLUMN
(example)
ROW (example)
5V
CPU
Board
+12V
+12V
CPU
Board
r-----~
LS 374SC ULN·2B03 4701
L
~
Open
H H
Closed L L
Off
On
Dedicated Switch Circuit
DEDICATED GROUND (example)
ROW
(exaf1l)le)
5V
CPU
Board
+12V
CPU Board
r-----~
L
J
Switch
Off
On
A
B
c
Open
Closed
H
L
H L
L H
The ADDAMS
FAMILY
3-5
E
c