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Consumer Electronics by S. P. Bali

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REED RELAY AND CROSSBAR EXCHANGES

A reed relay is a device based on the fact that an electric current passing through a coil of wire produces an electromagnet, with the ends of the coil having opposite magnetic polarities, as shown in Fig. 38.10.

These two strips can be used to form a switch in another electrical circuit. The two strips are placed inside a glass envelope containing an inert gas, and the overlapping portions are coated with gold to give a good reliable electrical contact. The whole assembly contained by the glass envelope is called a reed insert, since it is placed inside the electromagnet coil.

 

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Fig. 38.10 Coil of wire as ...

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