Magicland posted:Great! Had no idea you could pass DC through a bridge rectifier, just thought they were for converting AC to DC. Makes sense if you think about it. Was trying to figure out how to do the same thing via diodes, but that's much simpler, especially since I have a rectifier I can salvage (from the Williams board), and I'm completely out of diodes. Still have some 470 ohm resistors from the LED I put in the backup light on the camelback (also used them for directional lighting in my Williams RDC). Now I'm wishing I'd ordered more than 20.
Well, obviously you can do the same with diodes, four diodes make a bridge rectifier! 
Dennis Holler posted:Dang it, two of the three MTH couplers I have are the later Proto 2/3. I assume the ones Scott sells from 3rd rail are for the ERR conversions.
Also wanted to ask before I order stuff, is there room in that K4 tender for the big fatboy speaker and if so, is the sound difference enough to make a difference? I suppose the real answer lies in well try it out and compare! lol. I'm just trying to not miss some fixins on the first order of components.
Anything ERR sells is for Lionel, so they're compatible.
I think the large fatboy speaker will be a long shot, it's probably too tall, the tender is fairly short. Also, you'll have to do some surgery on the mounting rails to clear a 2" speaker, I used a 40mm one in this upgrade. Of course, you also have to drill the holes for the speaker as the stock one (at least this one) didn't have sound, so there is no provisions for the speaker. Finally, you'll have to remote the weight in the tender, it doesn't leave enough room for the board and the speaker. I ended up gluing the same 8oz of weights to the tender shell to give the tender a little "heft" again. Without the weight, it pretty easily gets yanked off the rails with any reasonable load.
