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Parts for Marklin 67014 Z Scale Power Pack

Mari asks:

“Marklin 67014 Z Scale Power Pack has a single-knob operation for changing the direction of travel by turning the control knob away from the center position. What parts and circuits do Marklin 67014 use to achieve this single-knob operation? Fleischmann 6752 also has single-knob operation. What does Fleischmann 6752 use? Do they use double potentiometers?”

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