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Engineering Symbology Prints and Drawings Volume 2 of 2 | Next
Figure 7 NPN Transistor-Conducting |
DOE-HDBK-1016/2-93
ELECTRONIC DIAGRAMS, PRINTS, AND SCHEMATICS
Electronic Diagrams and Schematics
PR-04
Page 8
Rev. 0
Figure 6 Schematic Showing Power Supply Connections
In any circuit, a ground must be established to create a complete current path. Ground is usually
depicted by the use of the ground symbol that was shown previously. The direction of current
flow can be determined by observing the polarity of the power supplies. When polarities are
shown, current flow can be established and ground may not always be shown.
With the power sources located and the ground point established, operation of the devices can
be determined.
The most common semiconductor devices are the transistor and the diode. They are made from
materials like silicone and germanium, and have electrical properties intermediate between
conductors and insulators. The semiconductor will be one of two varieties, the PNP or NPN.
The designation indicates the direction the electrons move through the device. The direction of
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