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The diode is basically a one-way voltage-controlled current switch. It allows current to flow in the forward direction when a forward bias voltage is applied, but when a reverse bias is applied the current flow becomes extremely small. Diodes are used extensively in electronic circuits. Applications include rectifiers to convert AC to DC, waveshaping circuits, peak detectors, DC level shifting circuits, and signal transmission gates. Diodes are also used for the demodulation of amplitude-modulated (AM) signals.
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