LOGIC RAIL Block Animator/2-SBCA Instructions Manual page 3

3-light Bulb-based Signals (e.g. older NJ International)
Wiring for 3-light bulb-based light signals is shown in Figure 2 using the Eastbound signal outputs; the connections are
similar for the Westbound signal outputs. You will need the current limiting resistors if the voltage rating of the bulbs is
lower than the input voltage to the Block Animator/2. 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
www.mouser.com part number 291-100-RC). If the input voltage is equal to or slightly lower than that of the bulbs then no
resistors are needed.
2-light Bulb-based Signals (e.g. older NJ International)
Wiring for 2-light bulb-based light signals is shown in Figure 3 using the Eastbound signal outputs; the connections are
similar for the Westbound signal outputs. You will need the current limiting resistors if the voltage rating of the bulbs is
lower than the input voltage to the Block Animator/2. 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
www.mouser.com part number 291-100-RC). If the input voltage is equal to or slightly lower than that of the bulbs then no
resistors are needed.
Position Light Signals (common anode LED or bulb-based)
Wiring for position light signals is shown in Figure 4 using the Eastbound signal outputs; the connections are similar for the
Westbound signal outputs. For common anode LED signals you MUST use current limiting resistors! You'll also need
current limiting resistors with bulb-based signals if the voltage rating of the bulbs is lower than the input voltage to the Block
Animator/2. 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
RC). If the input voltage is equal to or slightly lower than that of the bulbs then no resistors are needed. For LED signals the
value of the current limiting resistors depends upon the value of the input voltage to the Block Animator/2. For a 16V input
voltage we recommend a resistor value of either 390 ohms (e.g.
(e.g. www.mouser.com part number 293-330-RC); you should use ½ watt resistors. Use a higher value for the center LED;
we recommend a value of 680 ohms (e.g.
Figure 2 – 3-light bulb-based signal
Figure 3 – 2-light bulb-based signal
www.mouser.com
www.mouser.com part number 291-680-RC).
Green
Bulb
Red
Bulb
Yellow
Bulb
Current limiting resistors
(see text)
Green
Bulb
Red
Bulb
Current limiting resistors
(see text)
www.mouser.com
part number 293-390-RC) or 330 ohms
part number 291-100-
3