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History
Varicap
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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.
Australian market band I-III-U television tuner with varicaps highlighted
Australian market band I-III-U television tuner with varicaps highlighted
Consumer AM-FM broadcast tuner with varicaps highlighted
Consumer AM-FM broadcast tuner with varicaps highlighted
Diode
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A diode is a two-terminal electronic component that conducts current primarily in one direction. It has low resistance in one direction and high resistance in the other.
Close-up view of a silicon diode. The anode is on the right side; the cathode is on the left side (where it is marked with a black band). The square s
Close-up view of a silicon diode. The anode is on the right side; the cathode is on the left side (where it is marked with a black band). The square silicon crystal can be seen between the two leads.
A high power vacuum diode used in radio equipment as a rectifier.
A high power vacuum diode used in radio equipment as a rectifier.
Various semiconductor diodes. Bottom: A bridge rectifier. In most diodes, a white or black painted band identifies the cathode into which electrons wi
Various semiconductor diodes. Bottom: A bridge rectifier. In most diodes, a white or black painted band identifies the cathode into which electrons will flow when the diode is conducting. Electron flow is the reverse of conventional current flow.
A vacuum tube containing two power diodes
A vacuum tube containing two power diodes