| 摘要 |
A visual indicator is provided which monitors the operating conditions of a model track system having electrically propelled vehicles and simultaneously provides an indication of the speed of the vehicle on the trackway and of any faulty conditions that may exist along the tracks. A semiconductor transistor circuit separates ripple voltage produced by commutation in the electrical motor that propels the vehicle from the full wave rectified voltage of the energizing source of the model system. Operation of the transistor circuit in response to ripple voltage drives a meter instrument calibrated to indicate speed of the vehicle, while deflections due to faults provide an indication of a fault at the location of the vehicle on the track.
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