Can HO Scale MTH PS3 boards be used in O scale

Well, it should work, the HO boards work on my testset with the O-scale PS/3 tach reader.  I have no idea of the capacity of the motor drive, but I'd assume that less than an amp max would probably not tax them too much.

I'd be careful here. Most of the MTH HO manuals will say that you can only use DC power sources and do not use AC as it will damage the board.

Thanks H1000!  I found an F7 operators manual, and it confirmed your statement

Presumably adding a rectifier/capictor will take care of that.   Was that eliminated on the HO Scale boards to save space?

As for the operating voltage, the MTH HO Operating manual also states

"About 16 volts DC is adequate for prototypical speeds however, your engine can handle up to 24 volts DC if you feel the need for speed!"

As for the current draw of the locomotove, the manual states 23-650 mA.   That is not a limit, just what the loco draws.   I'll habe to measure the current draw of my MP54s to se what they require

@John Sethian posted:

Thanks H1000!  I found an F7 operators manual, and it confirmed your statement

MTH made AC and DC versions of the HO boards, there's a section in the test manual for each variety.

GRJ

Thanks.  So how does one tell which board is in which diesel?   And from what I can tell, the  HO Scale boards are 3/4" wide by 1" high by 2 3/4" long   Correct?