Frequently used switch symbols.
b. Wafer Switch.
The wafer switch is used to control several circuits
simultaneously, with a single control.
The individual sections (wafers) can be
added as needed, and all are connected to the same shaft. Two sections (decks) are
shown in A of figure 3-13. By turning the control knob, the circuits wired to each
wafer are either activated or deactivated. A typical individual section is shown
in B. In this section, the rotor lug (the contact lug at the right of the mounting
hole) is longer than the other lugs. At all times it is in contact with the metal
Notice that an extension at the outer edge of the center ring is
contacting lug 2.
Thus, lug 2 is connected to the rotor lug through the center
As the shaft is rotated, the center ring will connect other contacts, in
turn, to the rotor lug. By varying the number and length of contacts on the ring,
any number of connections can be made. The ring can be constructed in two or three
sections so that each section will make connection to a different circuit.
schematic symbol for a three-section wafer switch is shown in C of figure 3-13.
CONNECTORS, JACKS, AND PLUGS
When connecting certain circuits, it is sometimes necessary
to provide for disconnecting and reconnecting. In electronics, connectors