PolEi

This small circuit (developed by Gerald Klein) is intended for polarity testing when setting up DCC track systems - e.g. from modules. It is designed for voltages from 12 to 17 volts effective.

Usage:
Place the PolEi over the separation point so that each current collector has a track connection. The following statements are possible with the LEDs:

• LED left lights up: DCC signal present on the left track.
  
• LED on the right lights up: DCC signal present on the right track.
  
• Right and left LEDs light up: Both middle LEDs remain dark: DCC phase position at the track separation point is correct.
  
• Right and left LEDs light up, red LED flashes: Booster limits are reversed!¹
  
• LED right and left and the middle yellow LED lights up: there is a polarity reversal at the track disconnection point within a booster district!
  

miscellaneous

A description was published in "Digitale Modellbahn 01/2018".

Original files can be found her:

• https://fremodcc.sourceforge.net/diy/PolEi/index.de.html
  
• https://sourceforge.net/p/fremodcc/svn/HEAD/tree/PolungsPruefer/
  

A kit is available here:

• https://www.h0fine.de
  

An alternative housing can be found here:

• https://www.thingiverse.com/thing:4565243

Footnotes

1. Prerequisite for a correct measurement is that the two neighboring boosters are not supplied with power via a common power supply unit. ↩