
Rectifier diodes are the most commonly used diode type but other diodes come into play as well. These include Zener diodes, Schottky diodes, tunnel diodes, photodiodes, varicap diodes and light-emitting diodes. Each diode type has a different function. For example, Zener diodes control voltage, Shottky diodes work in switch circuits, light-emitting diodes are in lighting and video display circuits. Photodiodes are in light-detection circuits. A "varicap" diode is constructed like a diode but behaves as a variable capacitor.
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