Diodes, (English: Diode), electronic components, a device with two electrodes, only allows the current to flow through a single direction, many use of the function of its rectification. The variable capacitance diode (Varicap Diode) is used as an electrically adjustable capacitor. Most diodes have the current directivity we usually call the "rectifier (Rectifying)" function. The most common function of diodes is to allow only the current to be passed by a single direction (called a forward bias), which is reversed when blocking (called inverse bias). Therefore, the diode can be converted into an electronic version of the counter valve.
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