Slot Car Controllers
Often overlooked, the controller really can make a difference in how well you drive a slot car. Until the 1990's all controllers consisted of a wiper arm swiping along a resistor. The hotter the motor in the car, the lower the ohm or the resistor. For this reason, if someone wanted to race different classes, you would need different controllers or solder in a different resistor each race.
In the 1990's power diode and power transistor controllers appeared. Instead of varying current, these controllers varied voltage so for the first time, one controller could work for any type of slot car, HO slot car - wing racing.
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