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Figure 3-37.Optical coupler.
Figure 3-39.Transistor and UJT

Neets Module 07-Introduction to Solid-State Devices and Power Supplies
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3-34 TRANSISTORS Transistors are semiconductor devices with three or more terminals. The operation of normal transistors has already been discussed, but there are several transistors with special properties that should be explained. As with diodes, a discussion of all the developments in the transistor field would be impossible. The unijunction transistor (UJT) and the field effect transistor (FET) will be discussed because of their widespread application in Navy equipment. Many other special transistors have been developed and will be discussed in later NEETS modules. The Unijunction Transistor (UJT) The UNIJUNCTION TRANSISTOR (UJT), originally called a double-based diode, is a three- terminal, solid-state device that has several advantages over conventional transistors. It is very stable over a wide range of temperatures and allows a reduction of components when used in place of conventional transistors. A comparison is shown in figure 3-38. View A is a circuit using conventional transistors, and view B is the same circuit using the UJT. As you can see, the UJT circuit has fewer components. Reducing the number of components reduces the cost, size, and probability of failure. Figure 3-38A.—Comparison of conventional transistors and UJT circuits.






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