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How can we make a variable capacitor?
I'm trying to make a radio transmitter and I need a variable capacitor for tuning the frequency.
In that case, one way to make a variable capacitor is by using two metal plates separated by a dielectric material, such as air or ceramic. The distance between the plates can be adjusted using a screw or a knob, which changes the capacitance value. You can also use a rotary variable capacitor, which uses a set of movable plates that rotate around a fixed center electrode, to adjust the capacitance value.