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A butterfly capacitor is a form of rotary variable capacitor with two independent sets of stator plates opposing each other, and a butterfly-shaped rotor arranged so that turning the rotor will vary the capacitances between the rotor and either stator equally.
Variable capacitors: Air gap tuning capacitors: Air: Circular or various logarithmic cuts of the rotor electrode for different capacitance curves. Split rotor or stator cut for symmetric adjustment. Ball bearing axis for noise reduced adjustment. For high professional devices. Large dimensions. High cost. Vacuum tuning capacitors: Vacuum ...
A simple demonstration capacitor made of two parallel metal plates, using an air gap as the dielectric. A capacitor consists of two conductors separated by a non-conductive region. [23] The non-conductive region can either be a vacuum or an electrical insulator material known as a dielectric.
Air gap tuning capacitor. Capacitors and inductors are applied together in tuned circuits to select information in particular frequency bands. For example, radio receivers rely on variable capacitors to tune the station frequency.
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The gap is often an air gap, (≈1) and the material has a higher dielectric. As the material gets thicker, the capacitance increases and is sensed by the system. A sensor for measuring fluid levels works as two capacitors in parallel with constant total area.
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