Published:2013/6/7 21:28:00 Author:muriel | Keyword: Basic Toy Throttle , Push Button Control | From:SeekIC
This next circuit is a variation on the Basic Toy throttle. In this version three push buttons are used to control the output.
Button S1 causes the train to move in one direction while S2 moves it in the other. Button S3 is the Quick or emergency brake that will stop the train very quickly.
An interesting feature of this system is that the train could be brought to a stop and then move off in the opposite direction by pressing only one button. Useful for shunting perhaps.
Resistors R5, R6, R7 and diodes D1, D2 form a voltage limiter that reduces the maximum output voltage swing as mentioned in the potentiometer controlled circuit description.
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