variations to meet special applications.
Figure 1-29 shows the
schematic symbol for some commonly used diode applications.
are generally labeled with the letter "D" or the letters "CR."
Exceptions are the symbol for the zener diode, which is often labeled
"VR", and the light-emitting diode (LED), which may be labeled "DS."
c. Special Purpose Devices. As indicated above, transistors and
diodes may be constructed in a variety of designs to meet the needs
of special applications. While it would be impractical to attempt to
list them all, some of the more common special purpose solid-state
symbols are shown in figure 1-30. The symbols shown are as follows:
Silicon-controlled rectifier (SCR).
Silicon-controlled switch (SCS).
Field-effect transistor (FET).
Unijunction transistor (UJT).
Light-emitting diode (LED).
Special Purpose Solid-State Devices.