Toy Throttle with Zero Indication

Published:2013/6/7 21:29:00 Author:muriel | Keyword: Toy Throttle , Zero Indication | From:SeekIC

With this type of throttle would be difficult to know when the output is at ZERO . To help with this a ZERO indicator has been added to the next drawing. The indicator can also show the trains direction. The above schematic shows the addition of a Zero Indicating circuit to the throttle. When the output voltage is between +0.7 and -0.7 Volts both of the LED's, D3/4 will be OFF. As the output voltage increases, either PLUS or MINUS, one of the LED's will turn ON. This will allow the operator to know when the throttle's output voltage is near ZERO and the train is safely stopped. As there are two LED's, they can also show the direction of travel based on the polarity of the output voltage. A two colour LED could be used for D3/4. This will give a GREEN indication for one direction and a RED indication for the other. The next schematic shows an optional ZERO indication method. In this case the LED will be ON when the throttles output is near ZERO.



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