I have a Hornby 3 rail DC O gauge engine I want to run with my O gauge trains. 1 direction only. What size rectifier do I need to put in the engine?
Get a bridge rectifier capable of 4 amps or more and 50 volts or more.
Dallee Electronics has a board that includes a reversing unit. Suggest contacting them. Probably best to call, since a lot of inquiry emails land in his spam filter, and he often just clears them.
Definitely agree about the Dallee. Used a couple myself, including mpc era dc-only trains to convert to AC. Works like a champ.