Hi im juist testing a PS 2 3 volt board ona 6-8-6 turbine!Question below

Is it just running at the wrong scale speed?  Is the speed still controllable from the remote?  If you crack the throttle and it takes off at full speed, that's a speed control issue.  Likely suspect in that case would be the tach sensor, flywheel tape, wiring, or an amp on the power supply board.

It's simple to load the correct sound file and see if that corrects things if it's just the scale MPH that's off.

Alan,

Your thought process seems to me to be sound, even though smaller drivers instead of larger ones cause less ground to be covered, rather than more.

However, other factors such as gear ratio and motor size also make a difference.

Regardless, odds are that the sound file is the reason the speed is off.

Thanks Barry. sorry for confusing the other guy with DCS was just trying to help, i still think he's having trouble maybe you can straighten him out  . thanks for all your help!

Alan

John the engine runs fine with the other board that was in it and i can control the speed a little ounce you roll the thumb wheel above 2 it takes off fast bi it has the big boy steam file in the boards i was only trying to make sure the board works bu the engine I'm using is a turbine 6-8-6 which work fine with the other boards in it.the only reason i don't want to change the sound file is it is saved for my big boy upgrade.John do you think its a board issue or sound file. which is wrong for the engine it's in?

Alan

P.S. the only way to get it to slow down is go below 1 and then the engine will stop and if increase above 0 to another number it will start up again

Alan

Swap the power supply board and see what happens.

yes i think your right it is a bad power supply op amp runs full speed and also forget engine address, with another board works perfectly!

just need op amp part numbers from digikey, thanks Alan

The IC is U12, an LMV358M.

Thanks john i found the op amp and you confirmed it thanks for all your help,looks like there .48 cents,cheap but looks like a pain in the but to solder in very very small. thanks Alan

i see the board uses 2 of them,will order a couple of extra's ! thanks for all your help and have a happy Easter Sunday tomorrow, going to see my grandchildren !

Thanks Alan