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Inductor Identification
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Transistors.
TM 9-254 7-7.  Semiconductor Identification a.   Diodes.    Diodes  also  are  found  in  many  shapes  and  sizes.    They  perform  a  wide  variety  of  functions  within  a  circuit such  as  rectifying  an  AC  voltage  or  waveform  shaping.    Diodes  are  typically  marked  with  a  number  consisting  of  IN followed  by  a  series  of  numbers.    The  IN  identifies  the  part  as  a  diode  and  the  following  numbers  identify  the  particular type of diode.  Figure 7-13 shows some of the typical sizes and shapes in which diodes are found.  This figure provides an aid in identifying the positive (anode) and negative (cathode) terminals of the diode as related to the schematic symbol for a diode which is shown in figure 7-14.  Diodes and other electronic components must be installed with the correct polarity to  function  properly.    If  the  polarity  is  reversed,  the  diode  as  well  as  the  rest  of  the  associated  components  and  circuit could  be  damaged.    The  polarity  of  a  semiconductor  is  usually  shown  by  colored  dots,  bands,  caps,  letters,  or  symbols, and positive (+) or negative (-) signs. Figure 7-13.  Typical Diode Shapes and Markings ANODE (+) (-) CATHODE Figure 7-14.  Diode Schematic Symbol 7-14  Change 6

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