RailPro > RailPro Specific Help & Discussion
Keep Alive installation w/ Railpro
Alan:
The reason for the bridge rectifier is because we do not have access to the output side of an LM internal bridge. DCC decoders offer access to the output side of their internal bridge and that is where KAs are designed to be connected. Ring is moving in that direction, although not there yet, with the pinout rearrangement on the new LM3.
Any KA, regardless of manufacturer, if connected ahead of a module will require a bridge rectifier.
DCC AC or unknown DC polarity voltage is derived from the rails and fed to the module (decoder). Inside the module the power moves thusly: --> Bridge rectifier --*2--> Filter caps --> Regulator --> Stabilization caps --*1--> PWM controller --> Output to motor. The LM3 pin arrangement allows us to tap into where I marked as *1. DCC decoders and what we need in an LM is to be able to tap into where I marked *2.
It is literally nothing more than an additional 'wire' inside the module and a pin in the connector. Simple, right? Not so. It means redesigning the LM PCB, something that would be expensive for Ring.
We are not waiting on a Ring KA per se. We are waiting on Ring to make available connection to the output side of the internal LM bridge. With that, we could use any KA we wish. Should that occur then, Jacob, your KAs will still work fine. You will simply discard the bridge rectifier and attach you KA to the new LM wires.
Alan:
A keep-alive for RailPro:
Morebassman:
A video of this install would be great for the electricaly challenged! That's me
TwinStar:
Here is my BLI E8. LM-2S, TCS KA-3, bridge rectifier, and 2 iPhone 6S speakers.
nodcc4me:
Lots of room in there. 8)
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