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Power supply for realistic control of model railroad engines

  • US 3,994,237 A
  • Filed: 10/06/1975
  • Issued: 11/30/1976
  • Est. Priority Date: 10/06/1975
  • Status: Expired due to Term
First Claim
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1. A power supply for realistic control of a model railroad engine comprising, in combination:

  • a linear ramp generator for producing a linear ramp signal;

    a pulse generator for generating a train of pulses;

    an output circuit with an output terminal responsive to both said linear ramp signal and said train of pulses, said output circuit producing an output signal at said output terminal for powering the model railroad engine, said output signal having a level proportional to said linear ramp signal in absense of a pulse and at a maximum level when a pulse is present; and

    means for disabling said pulse generator whenever the level of said linear ramp signal is greater than a given level.

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