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Speed regulator for model trains

Speed regulator for model trains
Speed controllers fo model trains exhibiting a perfect regulation characteristic are few and far between. With most controllers, speed is load-dependent. Attempts at correcting this annoying circumstance often cause loss of pull, which is, of course, undesirable. The circuit described here uses the reverse electramotive force (emf) generated by the 10- comotive motor as a correction signal for a pulsewidth contral system. In practice, this method results in an appreciable cornpensation of load variations, so that the speed of the locomotive remains reasonably constant.
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