Run-N-Smooth PowerKeeper



The Run-N-Smooth PowerKeeper is a micro-size stay alive module that improves the running quality of N-scale and space-constrained DCC locomotives. With integrated protection circuitry and built using micro capacitors, the Run-N-Smooth PowerKeeper provides a simple, easy, and safer alternative for small installations.

Developed in conjunction with, and also available from, Scale Sound Systems.  Check out their wide range of high-performance speakers and accessories to take your locomotives to the next level!

While not a stay-alive in the traditional sense (these will not provide multiple seconds of sound+lights+motor over dead track), the Run-N-Smooth PowerKeeper will provide a noticeable and much needed insurance against rail and wheel oxidation, mild dirt/grime and slight tracking imperfections. With N-scale’s smaller wheel-to-rail contact area combined with it’s lighter weight, reliable DCC operation is of greater concern than in the larger scales.  With the Run-N-Smooth PowerKeeper, stalling, annoying sound drop-outs, and flickering lights can be a thing of the past!


  • Ultra small for N-scale locomotives
  • 940uF typical capacitance
  • Integrated protection circuitry
  • Safer tantalum polymer capacitors

While standard manganese oxide tantalum capacitors have been used for years to improve the running characteristics of N-scale DCC locomotives, these capacitors can fail catastrophically (i.e. fire), especially if operated near or above their rated voltage.  Protection circuits have been developed that limit the voltage across the capacitor, but manually assembling these circuits in a small space can be cumbersome.

The Run-N-Smooth PowerKeeper addresses these problems by using tantalum polymer capacitors.  Not only do these capacitors have higher energy density (more capacitance, smaller size) than traditional tantalum capacitors, they also have a benign failure mode should a failure happen.  In addition, voltage limiting protection circuitry is included onboard to improve the long term reliability of the capacitors, all while maintaining an ultra small footprint.

Warning: The Run-N-Smooth PowerKeeper only operates with a DC voltage. Do NOT connect it to track power!  Doing so will do nothing and risks destroying the device.


Length: 0.36" (9.1mm)

Width: 0.41" (10.4mm)

Height: 0.18" (4.65mm)


The complete gEDA design files are available on GitHub.


Package Insert / Connection Diagram

  • $19.00

  • 6 or more $18.00
  • 12 or more $17.00
  • 6 in stock


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