3-light Bulb-based Signals (e.g. NJ International)
Wiring for 3-light bulb-based light signals is shown in Figure 2. You will need the current limiting resistors if the voltage
rating of the bulbs is lower than the input voltage to the Signal Animator. For example, if the input voltage is 12V and the
bulbs are rated at 1.5V (get this information from the manufacturer of the signal) then we would suggest a resistor value of
330 ohms, 1/2W (e.g Radio Shack #RSU 271-1113). If the input voltage is equal to or slightly lower than that of the bulbs
then no resistors are needed.
C
Y
R
G
A
C
G
N
D
D
C
+
5
V
P
C
Figure 2 – 3-light bulb-based signals
2-light Bulb-based Signals (e.g. NJ International)
Wiring for 2-light bulb-based light signals is shown in Figure 3. You will need the current limiting resistors if the voltage
rating of the bulbs is lower than the input voltage to the Signal Animator. For example, if the input voltage is 12V and the
bulbs are rated at 1.5V (get this information from the manufacturer of the signal) then we would suggest a resistor value of
330 ohms, 1/2W (e.g Radio Shack #RSU 271-1113). If the input voltage is equal to or slightly lower than that of the bulbs
then no resistors are needed.
C
Y
R
G
A
C
G
N
D
D
C
+
5
V
P
C
Figure 3 – 2-light bulb-based signals
