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Speed control system for model railroads

  • US 4,085,356 A
  • Filed: 12/08/1975
  • Issued: 04/18/1978
  • Est. Priority Date: 12/08/1975
  • Status: Expired due to Term
First Claim
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1. A current supply for model railroads having a driving motor connected for receiving current therefrom which comprises a continuous DC speed control circuit controlling the armature current as a function of the counter electromotive force developed by rotation of the driving motor armature thereby to regulate the armature rotational speed, comparison means in which said counter electromotive force is compared to a speed control reference voltage of predetermined magnitude derived by a voltage divider across a DC supply, means controlling the current supplied to the motor armature with the resultant differential voltage, storage capacitor means for retaining a charge proportional to the reference voltage and switching means selectively controlling the charge and discharge of said capacitor means to simulate braking and acceleration.

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