Modernized "Toy" Throttle

Published:2013/6/25 22:02:00 Author:muriel | Keyword: Modernized "Toy" Throttle | From:SeekIC

This throttle is an upgrade of the type of throttle that is supplied with many of the HO train sets that are popular at Christmas time. These throttles do not have a reversing switch but instead have a center OFF position on the speed control knob. While this throttle may seam like a step backward in the evolution of train controls it does have features that make it useful in certain situations. Due to its one control operation it would be ideal for small children and persons with reduced hand dexterity. There is no chance of the direction suddenly being reversed while the train is under way as the output control would have to pass through ZERO in order to change direction. It would also be possible to have a spring loaded, one axis joystick type control that would automatically stop the train when the lever is released and as there is only one control it could be as large as desired. Again this might be helpful for someone who could not easily manipulate small controls or small children who would have an easier time with just one control.The above schematic shows the basic Toy Throttle. It is powered by a 24 Volts AC, Center Tapped transformer to provide PLUS and MINUS voltages. The throttle uses a Push-Pull amplifier that eliminates the need for a reversing relay or switch. When resistor R2 is in the CENTER position the throttles output voltage would be ZERO . Adjusting R2 up or down would produce positive or negative voltage to the track thereby controlling the trains direction. Resistors R1 and R3 limit the maximum output voltage to between PLUS or MINUS 10 Volts.



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