Basic HTML Version
Flipper Coil Circuits
Left Flipper Ci reu it
I FLiPTRONIC ilBOARD -
-
l
IJ901
I
~
I
3
5
I
J902
I
I
I
I
I
I
I
I
I
f--t--'-=="---~
U P
per Left
I
End-of-Stroke
L
'--r'=-"'-"-_J
Switch
________
Right
Flipper Circuit
IFLIPTRONIC IIBOARD -
-
l
I J901
I ~
I
3
5
f--*------'
I
J902
I
I
I
I
I
I
I
I
I
I
L
_
I
Playfield
Flipper End-of-Stroke Switches
F1
F5
F3
F7
rF-----------l
FLiPTRONIC II BOARD
+12
I
I
+5V
V
I
II
1 K
J906
II
End-of-Stroke Switch
1N4004
I
A
Black-xxx
I
74HCT244
I
Dedicated Input
L
= __
J
Switch
H
L
A
B
Off
On
Open
Closed
H
L
The flipper switch circuits operate similar to the dedicated switch circuit. The circuits are active low and
tied to ground through the switch.
When a switch closes the row side (dedicated input) of the circuit activates. The "+" input to the LM339
drops below +5V therefore its output is low.. Since the row (dedicated input) circuit is tied directly to
ground through the switch, the switch is considered closed by the microprocessor. When the switch
•
opens, the "+" input to the LM339 is about +5V, its output is high and the row (dedicated input) is inactive.
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