3
2-light signal wiring
Wiring for 2-light bulb-based light signals is shown in Figure 3. Three diodes (e.g. Radio Shack #276-1101) must be added to
the yellow and green outputs as shown. You will need the current limiting resistors if the voltage rating of the bulbs is lower
than the input voltage to the
BA
. For example, if the input voltage is 16V and the bulbs are rated at 12V (get this information
from the manufacturer of the signal) then we would suggest a resistor value of 100 ohms (e.g Radio Shack #RSU 11345519.
If the input voltage is equal to or slightly lower than that of the bulbs then no resistors are needed.
NOTE: The C terminal is
not used with this signal type!
Figure 3 – 2-light bulb-based signal
Bulb-based Position Light Signals (e.g. NJ International)
Wiring for bulb-based position light signals is shown in Figure 4 below. You will need the current limiting resistors if the
voltage rating of the bulbs is lower than the input voltage to the
BA
. For example, if the input voltage is 16V and the bulbs
are rated at 12V (get this information from the manufacturer of the signal) then we would suggest a resistor value of 100
ohms (e.g Radio Shack #RSU 11345519). If the input voltage is equal to or slightly lower than that of the bulbs then no
resistors are needed.
C
Y
R
G
E
a
s
tb
o
u
n
d
C
Y
R
G
W
e
s
tb
o
u
n
d
B
lo
ck
A
n
im
a
to
r
E1 W2 E2 W1 5V DC GND AC IN
Current limiting resistors
(see text)
Common
Clear position
Stop position
Approach position
Center bulb
Figure 4 – Bulb-based position light signals
