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What is a variable-capacitance diode?

This is a circuit diagram symbol for a variable-capacitance diode.

Variable-capacitance diodes are abbreviated as VCDs. They are also called varicap diodes.
Variable-capacitance diodes has a variable capacitance which is a function of the voltage between anode and cathode.
General-purpose diodes are used for rectification and signal detection, and variable-capacitance diodes are used for RF impedance matching in automatic tuners and transmitters.

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