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NK8047 & NK8047-2 Pre-wired Campfire Kits


Product & installation overview:

 The NK8047 & NK8047-2 are designed to generate enhanced lighting effects for a single LED connected to its outputs (solder points 3 & 4) when power is applied to the inputs (points 1& 2), and will simulate the random flicker of a crackling campfire, fireplace or locomotive firebox.

 Utilizing the industry’s smallest  microcontroller and associated voltage control circuitry, these modules with LED, consume less than 20 ma. This makes the NK8047 or the NK8047-2 well suited for low power applications such as battery operation but can easily be powered by any well-filtered and regulated DC power source with an output of 6-18VDC. The very small overall size of this module will allow it to be easily placed in and around any structure.

Connecting the NK8047 & -2:

 Installing the NK8047 is very straightforward. Because the module has circuitry on both sides, care must be taken to be sure that the components or wire solder points will not make contact with any metal object which could cause a short  circuit.

 This kit is pre-wired with input power wires already connected. The red wire is for connection to +DC and the black wire is for connection to –DC (ground). These wires are pre-tinned for easy soldering  to your power source. Figure 1 below shows a close-up of the circuit and wiring connections. Points 3 & 4 connect to the attached Incandescent LED.

Important note: A low-wattage iron with a pointed tip should be used for connection of wires. Too much heat or solder can easily damage the wires.


The LED for the NK8047 is a Ngineering N1013 Yellow Micro LED and will provide sufficient brightness for a realistic campfire effect. The brightest light output will be seen from the front of the LED surfaces, but these LEDs do also have relatively bright “side-shine” allowing good viewing over a horizontal angle of up to 150 degrees. Plan the positioning of the LED in your model to “point” them toward the middle of the viewing angle for best  effect.

 We recommend mounting the LED from the back by attaching adhesive to the wires near the back of the LEDs so adhesive is not placed directly on the LED. It is also recommended that whatever adhesive is used that it does not contain high aggressive solvents that could attack the insulation on the wires. Walthers Goo is an example of an “aggressive” solvent type adhesive. Elmers white Glue, CA (superglue) and 2-part epoxies are very safe for this type of mounting and will not damage wires or surfaces of your model in most cases.

 If the LED is to be mounted slightly above a flat surface, we recommend cutting a narrow slot from the edge of the surface to slide the wires into position where the LED is to be located. Then gluing the wires in position will be very easy and hold the LED in place while the adhesive dries.

 This completes hookup of our NK8047 Campfire module.

The LED for the NK8047-2 is a Ngineering N1053 Yellow 5mm LED. This LED's brightness output is substantially greater than the LED in the NK8047 and is intended for projects in larger scal modeling such as O and G scale.

Installation of the NK8047-2 and LED mounting follow the same procedure as indicated for the NK8047 above.


We hope the added realism it provides enhances your enjoyment of the hobby.



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