The rotor plates are attached to the shaft that is used to adjust the capacitance. Figure 3-1: Air dielectric variable capacitors consists of interleaved stator and rotor plates. (A) Schematic view; ...

But capacitance is only part of the circuit, with inductance being the other important portion. Since variable capacitors that are capable of affecting a large change on the frequency of a circuit ...

Variable capacitors are no longer as plentiful ... you’d expect a similar coil to form the inductive part of a tuned circuit, but this coil is shorted out to prevent its inductance becoming ...