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Reference.org
Varicap
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<p>A varicap diode, varactor diode, variable capacitance diode, variable reactance diode or tuning diode is a type of <a href="/facts/Diode/JyaoyGnk">diode</a> designed to exploit the voltage-dependent <a href="/facts/Capacitance/0pH046TL">capacitance</a> of a reverse-biased <a href="/facts/P%25E2%2580%2593n_junction/CaKIdLPg">p–n junction</a>. </p>