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Recommendation For TMCC OTC Separate Power Supply

mopac01mopac01OGR Forum Member DIGITAL SUBSCRIBER

I'm planning on getting my son an MTH operating milk car and want to have it controlled from a Cab-2.  I've ordered a TMCC OTC (since there is no Legacy OTC2 module).  I already have a SER2 in the legacy setup so it shouldn't be a problem to add in the OTC module.  I'm noting the instructions, and other posts on the forum, seem to strongly recommend a completely separate power source for the OTC module.  I've seen posts where problems surface when using a different terminal on the same transformer (like the accessory power on a ZW-L that's also powering the tracks).   I have a PW KW that I could use for this end short term, but that's awfully bulky and possibly an energy waster.  Can someone suggest a simple "wall-wart" type of transformer I could use for powering the OTC (or possibly 2 of them).  I'm not really looking to use a smaller Lionel/MTH transformer just to power the OTC as I don't own any.  I'd prefer just a wall-wart type of dedicated unit not taking up shelf space next to the ZW-L.  (I really just want to use the KW for test track type use infrequently.)

Last edited by mopac01
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mopac01mopac01OGR Forum Member DIGITAL SUBSCRIBER

I'm actually planning on that route although I have a number of operating cars.  And at least for the moment it's cheaper to automate the track than all of the cars.  Plus, until a new operating car like the one I'm buying my son is out of warranty, I don't want to modify them and void that warranty.

mopac01mopac01OGR Forum Member DIGITAL SUBSCRIBER

Looking at Amazon I've found 2 choices:

1) https://www.amazon.com/dp/B00G7RTUBA?psc=1  This is the one I think I prefer as it's not as bulky.  It's specifications are input of 120VAC 60Hz 20W and output 12VAC 1200mA

2) https://www.amazon.com/gp/prod...;smid=A3AFCSA6JU2B0W  This one has a grounding prong but although that's necessary for the Legacy 990 base I don't think it's necessary for the OTC power supply. Correct?   It's specifications are input of 120VAC 60Hz 50W and output of 12VAC 20VA

The OTC manual shows specifications for the OTC input as from 9 through 20 VAC and 50mA.   If I'm comparing correctly, the first transformer above is closer to the requirements of the OTC and the second one seems overkill.  And given the much larger size of the second one that would just seem like a waste of space for no good reason.

How do I test which lead is the positive (A) and which is the negative (U) from the transformer output heading to the OTC input terminals?

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