When a PN junction is integrated into the electrode lead and the case, it forms a semiconductor diode that exhibits unidirectional conductivity. This means that current can flow easily in one direction but is blocked in the opposite direction. The graphical symbols used to represent diodes are illustrated in Figure 1-31.
   Figure 1-31: Diode Graphic Symbols
Understanding these symbols is essential for interpreting circuit diagrams and identifying the function of diodes in electronic systems. Diodes are widely used in rectification, signal modulation, and protection circuits. Their ability to control the direction of current makes them fundamental components in modern electronics. Whether you're working on power supplies, communication devices, or digital circuits, knowing how to recognize and use diodes is crucial.
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