E-Book Your Book

Abbrevations
Electronics Dictonary
Components
Basic Electronics
Digital Electronics
Fiber Optic Demo's

REED SWITCH:

Basically, the reed switch consists of two springy metal strips (reeds) sealed in a glass tube, filled with an inert gas which prevents corrosion.

The switch is activated by an external magnetic field. This field can be provided by bringing a permanent magnet close to the switch, or by passing current through a coil which is wrapped around the switch.

It can be used as part of an intruder detection system, with a magnet fixed to a door and the switch fitted to the door frame.

It can also be used as a high speed relay. Reed relays require much lower operating current than normal relays