HotSlots   Free shipping for orders over $100 Questions?(217) 355-2277
International Shipping

HotSlots RC Racing on Facebook!
HotSlots 1/32 on Facebook!
HotSlots 1/32 on YouTube!
HotSlots 1/32 Blog!

How Slot Car Controllers Work

Welcome to a technical discussion of slot car controllers. Most of the following tips are specifically for Professor Motor electronic slot racing controllers, but many would also generally apply to a conventional resistor type controller or any other technology.

Professor Motor "Plus" & "Silver" Series controllers use electronic semiconductors in place of resistive elements that are used in the more conventional controllers that have been produced since the 1960's. These electronic semiconductor devices have some really amazing properties that make them ideal for application in a device to control power to model racing cars. The most valuable of these properties is that these semiconductors have an almost constant voltage drop of around 600 millivolts (6/10 of a volt) independent of the amount of current going through the device. This results in a very wide range of control possible for a large number of different classes of cars and performance levels of motors for a single Professor Motor controller. On the other hand, conventional resistor controllers are highly sensitive to variation in motor performance whereas cars with very high performance motors generally need greatly reduced resistance in the controller and cars with very mild motors requiring much more resistance in the controller. This is evident in the tremendous range of available resistor values ranging from 0.4 Ohms to 90 Ohms. In effect, resistor controllers simply divide the available voltage between the voltage drop in the controller and the voltage drop across the motor. As a result, it is generally necessary to change resistors when changing classes of motors.

The semiconductor type design we use in effect subtracts from the available voltage the number of devices in the circuit times the 600 millivolts. For example, if the the controller is only slightly open, 10 of the available semiconductors might be in the circuit (of the 16 total that the controller carries), in this case 10x0.6 or 6 volts would be used in the semiconductors, with the remaining 8 volts (assuming a 14 volt supply) would be supplied to the car.

The semiconductors also are polarity sensitive. They conduct electricity in one direction, but block it in the other. This feature has some advantages and also some disadvantages. The advantage can come from a natural resistance to miswiring since the semiconductors will block the flow of electricity if proper polarity is not applied. The disadvantage of this polarity sensitivity that the controller can not immediately be used with negative polarity track wiring can be easily overcome by the addition of a polarity switch, now available for all Professor Motor controllers.

Tell a friend
Tell a friend about this article:  
Shopping Info
  Slot Car Article Directory
  R/C Article Directory
  Track Rental Info
  Payment Info
  Wish List
  Return Policy
  Store Location
  Privacy Policy
  Contact Us

Slot Cars Technical Info, Sets, Accessories, Slot Car Racing info | How do I choose a track set? | Scalextric Slot Cars | Carrera Slot Cars, Digital, Analog, Track Set Info | Carrera of America | 1/43 Carrera "Go" Slot Cars | Ninco Track Sets |
1/32 Carrera Slot Cars Digital132 | Ninco Slot Car Track Sets | Ninco Slot Cars, Great selection of Ninco Slot Cars! | Carrera Go Track Accessories, | Carrera Digital143 Track Accessories, | Carrera Slot Car Digital 132 Information | Scalextric Slot Car Race Track Sets | Slot Car Sets | SCX Digital Sets | Slot.It Slot Cars| | Racer Slot Cars | Hotslots Slot Car Shop and Hotslots R/C Racing Shop Urbana, Champaign, Illinois, Your Central Iillinois hq for R/C, Slot Cars, Sets, Visit our hobby stores today! |
We specialize in international shipping! Brazil, Trinidad and Tobago, Mexico, Japan, We ship anywhere! | R/C Cars, Trucks, Accessories, R/C Store Ill, RC shop central illinois, RC shop champaign urbana ill | 1/64 HO AFX Slot Cars | 1/32 Slot Cars
1/64 HO AFX slot cars race sets

SCX Slot Car Digital Track Sets, Slot Cars, and SCX Digital Track!

2003-2015 HotSlots 1/32 Slot Car Shop located in IL
1809 A Philo Road Urbana, Illinois, 61802