is this ok to power my TIU?

Gerry,

Its way too small for a TIU at only 9 volts and 300 ma. Spec calls for a 1.5 amp power supply at 12-22 volt, but the Radio Shack one, at 1.0 amp, seems to work fine.

I would not use the one that you have under any circumstances.

thanks Barry.

I use these from Radio Shack. I don't know if they are still available.

#273-1650 - 18-24 VAC, 1000mA AC Power Adapter

#273-1716 - Adaptaplug "M"

Bill,

Those have been replaced, From The DCS O Gauge Companion 2nd Edition:

Another source of power for the TIU's Aux. Power port is the Radio Shack "#273-331 "Enercell™ Switchable 18/24VAC 1 AMP Power Adapter with #273-344 Enercell™ Adaptaplug™ M. It should be used on the 18 volt setting.

This and a whole lot more is all in "The DCS O Gauge Companion 2nd Edition", now available for purchase as an eBook or a printed book from MTH's web store site! Click on the link below to go to MTH's web page for the book!

Now here's a possible dumb question, does polarity matter on the auxilary TIU power plug in, or will it rectify polarity on it's own? Add- what is correct for plug polarity...outside pos/inside neg...or vise versa?

I just found a wall transformer that's rated at 12v, 1.5amps and think this might be fine for powering my TIU board - but I haven't checked what the plug polarity is since it's not marked.  

Bob,

If you're using a wall wart to power the TIU via the Aux. Power port, polarity is not an issue.

The power adapter you describe this time sounds as if it will work fine.

Thanks Barry!