Sawgge rele 19 f published on 23 12 2012 by sepgo hardchab

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This ensures continuity of the circuit between the moving contacts on the armature, and the circuit track on the printed circuit board (PCB) via the yoke, which is soldered to the PCB.

When an electric current is passed through the coil it generates a magnetic field that activates the armature, and the consequent movement of the movable contact(s) either makes or breaks (depending upon construction) a connection with a fixed contact.

Such diodes were not widely used before the application of transistors as relay drivers, but soon became ubiquitous as early germanium transistors were easily destroyed by this surge.

Some automotive relays include a diode inside the relay case.

Suitably rated capacitors and the associated resistor are sold as a single packaged component for this commonplace use.

Magnetic latching relays are useful in applications where interrupted power should not be able to transition the contacts.

Typically this is done with a small copper "shading ring" crimped around a portion of the core that creates the delayed, out-of-phase component, Contact materials for relays vary by application.

Materials with low contact resistance may be oxidized by the air, or may tend to "stick" instead of cleanly parting when opening.

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