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A digitally tuned capacitor is an IC variable capacitor based on several technologies. MEMS , BST and SOI / SOS devices are available from a number of suppliers and vary in capacitance range, quality factor and resolution for different RF tuning applications.
In electronics, a varicap diode, varactor diode, variable capacitance diode, variable reactance diode or tuning diode is a type of diode designed to exploit the voltage-dependent capacitance of a reverse-biased p–n junction.
The two-element LC circuit described above is the simplest type of inductor-capacitor network (or LC network). It is also referred to as a second order LC circuit [ 1 ] [ 2 ] to distinguish it from more complicated (higher order) LC networks with more inductors and capacitors.
Capacitors for AC applications are primarily film capacitors, metallized paper capacitors, ceramic capacitors and bipolar electrolytic capacitors. The rated AC load for an AC capacitor is the maximum sinusoidal effective AC current (rms) which may be applied continuously to a capacitor within the specified temperature range.
Adjustable tuning is commonly achieved with a parallel plate variable capacitor which allows the value of C to be changed and tune to stations on different frequencies. For the IF stage in the radio where the tuning is preset in the factory, the more usual solution is an adjustable core in the inductor to adjust L.
Within each compartment can be seen (from top): the triode tube, the interstage coupling coil, and the capacitor attached to its front panel tuning dial. The compartments contain (from left): the 4 RF stages, the detector stage, and the 4 tube audio amplifier. The capacitors could be linked to a common shaft and tuned together, or tuned separately.
The variable capacitor is a mechanical device in which the separation of a series of interleaved metal plates is physically altered to vary its capacitance. Adjustment of this capacitor is sometimes facilitated by a mechanical step-down gearbox to achieve fine tuning. [2]
Founded in 1923 to provide tuning capacitors for the growing home construction market, by the Fillmore family in Lewisham, England, (there never was a pair of people involved who were Jackson brothers!) the firm went on to manufacture a huge variety of the, mostly air-spaced, two or three gang, variable capacitors, that were at the heart of all ...