Model Railway Forum

Brian wrote: ↑Mon Nov 26, 2018 10:41 am

JohnSmithUK wrote: ↑Mon Nov 26, 2018 8:33 am I may be showing up my lack of electrical knowledge here, but, could you not put variable resisters on the feeds to the individual lines to alter the speeds?

Not really, unless they are wire wound and are high current rated. Conventional potentiometers are only rated at a few milliamps normally they will quickly burn out if used to try and control a locos speed.

A fixed value wire wound 10 watt resistor of the required Ohm value would reduce a track voltage, but be prepared for it to get hot! Plus its likely to cause issues with lower speed settings. The problem is the applied volts alter on DC from 0 to over 12 which in turn alters the wattage (VxA=W)

Montfort wrote: ↑Mon Nov 26, 2018 1:04 pm SWMBO keeps it in a secret vault.