Several variable capacitors are shown, there are many ways to think of a variable capacitor. A variable capacitor
is an open circuit to DC. A variable capacitor is a short to AC (if the frequency is high enough.) A variable
capacitor placed across a varying signal smooths out the higher frequencies, more with increased capacitance less
with decrease in capacitance. A variable capacitor placed in series with a varying signal removes the lower
frequencies, more with increased capacitance less with decrese in capacitance.
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