The A&O 2.0 will require resistive wheel sets for CTC detection. Here are samples of making your own wheels in O-scale. I chose 7.5K ohms and two resistive sets per car for, one per truck, for more certain detection when wheels start to get dirty. MMR Doug Geiger uses a single 5K axle on his HO scale Granite Mountain cars. Conductive paint is GC Electronics 22-207 Nickel Print.
Intermountain wheel set with 7.5K ohm "1206" case style surface mount resistor. Resistors are initially mounted with a tiny dab of thick ACC. The paint is GC Electronics Nickel Print, part 22-207.
Roughen and clean surfaces that will receive paint, otherwise it will peel away as it dries and shrinks. All glues are applied with a very sharp toothpick. For subsequent wheels I used an even smaller resistor, case style "0806".
Resistors are placed upside-down to expose more of the terminals to conductive paint. Avoid getting ACC on the ends of the resistor as that will create unwanted insulation.
If you apply too much Nickel Print, particularly to the axle, it can creep across the insulating bushing and cause a short circuit. If this happens, just scrape it away with the point of a #11 hobby blade. When first applied, Nickel Print is an insulator. As it dries, it begins to conduct electricity.
Note that all my Intermountain wheel sets were factory gauged between 8 and 12 thousandths too wide. Check and adjust wheel gauge first!
Roughen and clean surfaces that will receive paint, otherwise it will peel away as it dries and shrinks. All glues are applied with a very sharp toothpick. For subsequent wheels I used an even smaller resistor, case style "0806".
Resistors are placed upside-down to expose more of the terminals to conductive paint. Avoid getting ACC on the ends of the resistor as that will create unwanted insulation.
If you apply too much Nickel Print, particularly to the axle, it can creep across the insulating bushing and cause a short circuit. If this happens, just scrape it away with the point of a #11 hobby blade. When first applied, Nickel Print is an insulator. As it dries, it begins to conduct electricity.
Note that all my Intermountain wheel sets were factory gauged between 8 and 12 thousandths too wide. Check and adjust wheel gauge first!
Intermountain wheel set with 7.5K ohm "1206" case style surface mount resistor. Resistors are initially mounted with a tiny dab of thick ACC. The paint is GC Electronics Nickel Print, part 22-207.
Roughen and clean surfaces that will receive paint, otherwise it will peel away as it dries and shrinks. All glues are applied with a very sharp toothpick. For subsequent wheels I used an even smaller resistor, case style "0806".
Resistors are placed upside-down to expose more of the terminals to conductive paint. Avoid getting ACC on the ends of the resistor as that will create unwanted insulation.
If you apply too much Nickel Print, particularly to the axle, it can creep across the insulating bushing and cause a short circuit. If this happens, just scrape it away with the point of a #11 hobby blade. When first applied, Nickel Print is an insulator. As it dries, it begins to conduct electricity.
Note that all my Intermountain wheel sets were factory gauged between 8 and 12 thousandths too wide. Check and adjust wheel gauge first!
Roughen and clean surfaces that will receive paint, otherwise it will peel away as it dries and shrinks. All glues are applied with a very sharp toothpick. For subsequent wheels I used an even smaller resistor, case style "0806".
Resistors are placed upside-down to expose more of the terminals to conductive paint. Avoid getting ACC on the ends of the resistor as that will create unwanted insulation.
If you apply too much Nickel Print, particularly to the axle, it can creep across the insulating bushing and cause a short circuit. If this happens, just scrape it away with the point of a #11 hobby blade. When first applied, Nickel Print is an insulator. As it dries, it begins to conduct electricity.
Note that all my Intermountain wheel sets were factory gauged between 8 and 12 thousandths too wide. Check and adjust wheel gauge first!
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