1. The capacitor that can be adjusted is called a variable capacitor. The variable capacitor can be divided into air medium and organic film medium according to different media. According to the different structure, it can be divided into single variable capacitor ,double variable capacitor and quadruple variable capacitor.
Variable capacitors are often used in L/C circuits to set the resonance frequency, e.g. to tune a radio (therefore it is sometimes called a tuning capacitor or tuning condenser), or as a variable reactance, e.g. for impedance matching in antenna tuners.
Rotate the rotating shaft and lightly press the outer edge of the film group. No loose phenomenon should be felt. The variable capacitor with bad contact between the rotating shaft and the moving piece can not be used. (3) check whether there is a short circuit or electric leakage between the moving piece and the fixed piece.
Variable capacitors are used in LC resonant circuits to adjust the resonance frequency. The resonance frequency is inversely proportional to the square of the capacitance, allowing for precise frequency control. 2. Frequency Selective Oscillation
In order to adjust capacitance, a variable capacitor modifies the surface area of its overlapping plates. A variable capacitor, sometimes referred to as a tuning capacitor, is a kind of capacitor in which the capacitance can be mechanically or electrically altered on a regular basis.
The variable capacitor can be divided into air medium and organic film medium according to different media. According to the different structure, it can be divided into single variable capacitor ,double variable capacitor and quadruple variable capacitor. ( 1 ) Single variable capacitor.
OverviewMechanically controlled capacitanceSpecial forms of mechanically variable capacitorsHistoryElectronically controlled capacitanceTransducersNotesExternal links
A variable capacitor is a capacitor whose capacitance may be intentionally and repeatedly changed mechanically or electronically. Variable capacitors are often used in L/C circuits to set the resonance frequency, e.g. to tune a radio (therefore it is sometimes called a tuning capacitor or tuning condenser), or as a variable reactance, e.g. for impedance matching in antenna tuners.