1 "Just disconnect the winding wires of the gear coils (two100Ω coils in the figure below), and then connect the fast gear and the slow gear. I'm afraid it's hard for you to do it.

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2. If you want to shift gears faster and slower without using gear windings, you can connect a capacitor in series at one end of the power cord, and the capacitance is 2 ~ 4 μ f/450 V, which is determined by running the test speed.