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Pre-wired N Scale Position Light Signals |
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SOLD OUT
THANKS FOR YOUR SUPPORT
Alkem Scale Models is SOLD OUT Pre-wired N Scale Position Light Signals with cast brass targets.
Included in the package is one brass casting complete with hoods and mounting bracket, and an assembled circuit card with 9 surface mount yellow LEDs and 6 associated wire leads. The LEDs are wired with a common ground and 5 wires to control each set of lights. The center light also has a separate control wire, as it is usually lit in most applications. For more information about position light signals on PRR, N&W and other RRs see http://www.prrths.com/PRR_Signals.html
Left: Contents of kit. Right: Close up of target casting.
From Left to Right: Nine light signal mounted on an Alkem Scale Models Pole Signal kit (available separately), modified seven light signal, PRR standard drawing of a position light signal, and photo of a position light signal on the N&W. The PRR and its successors continue to use these signals. The N&W used yellow position light signals until the 1960s when they changed to color position lights. The B&O and Amtrak signals use color and position light signals. In the sample photos all the lights are lit for illustration purposes only. In actual use only three at a time should be lit depending on the desired signal indication. Click on images for larger views.
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SALE N Scale One Signal:
SOLD OUT |
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N Scale Four Pack :
SOLD OUT |
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(The sale price is $16.79 each, a 30 percent discount or 4 for $64.99, a 32 percent discount. This sale is only available direct from Alkem Scale Models to retail customers using Paypal or paper order form. Sorry, no dealer discounts on sale price or bulk packs.)
These LEDs are rated for less than 2.5v. Any voltage greater than this will require a ballast resistor (not included). 1000 ohms works well with a 9 Volt source. Attach the resistor to the common lead to protect all the LEDs. Make sure you use a ballast resistor before testing the lights. Voltage over loading the LEDs will burn them out! We cannot offer refunds for burnt out LEDs.
Test the circuits to identify which wire controls each set of lights. The wires have paper labels, but they must be removed if you wish to fit them inside the signal mast. Mark the wires with colored markers to differentiate them. Note that the center light has its own control wire. All the lights share a common lead that should be connected to the positive voltage source. The individual control wires should be connected to ground through appropriate control logic.
Gently twist wires into a single cable being careful to avoid breaking the solder joints. Paint exposed the wire leads near the head with enamel paint before doing this to avoid shorting the leads against one another.
Glue the circuit card with CAA to the back of the target casting insuring that all the LEDS are aligned with the holes in the casting.
Use thin wall tubing (we recommend K&S Special Shapes TT-62 1/16” x .006 Thin Wall Brass Tubing) to make the mast. All the wires will fit inside this tube. If using an Alkem Scale Models Pole Signal Kit (available separately) you will have to modify the etched holes to accommodate this tube. The holes on the etched parts of the pole signal are only 0.052 inches. To use the 1/16th inch (0.062") tube requires that you cut off half of the circle and solder the remainding half circle to the mast. If you can find it, thin wall hyodermic needle tubing can also be used for a finer appearance.
To convert the casting to a 7 light signal, snip off the unneeded hoods with a flush cutting pliers. Use a fine file to remove any residual parts of the hood being careful to not disturb the other hoods. Then glue two paper discs about 1/8th inch in diameter over the unused holes. Paint the hole covers flat black. This is essentially how the prototype railroad did it too! You can remove the wire for the set of LEDs that will not be needed.
