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A varistor (a.k.a. voltage-dependent resistor (VDR)) is a surge protecting electronic component with an electrical resistance that varies with the applied voltage. [2] It has a nonlinear , non- ohmic current–voltage characteristic that is similar to that of a diode .
Operation of a varicap. Holes are blue, electrons are red, depletion zone is white. The electrodes are at the top and bottom. Varactors are operated in a reverse-biased state, so no DC current flows through the device.
Wire crossover symbols for circuit diagrams. The CAD symbol for insulated crossing wires is the same as the older, non-CAD symbol for non-insulated crossing wires. To avoid confusion, the wire "jump" (semi-circle) symbol for insulated wires in non-CAD schematics is recommended (as opposed to using the CAD-style symbol for no connection), so as to avoid confusion with the original, older style ...