Reed switch has two contacts which are usually normally open and when it gets affected by nearby magnetic field the contacts close and make a closed circuit. Reed switch can also be used to make a relay. This is done by adding a wire coil around the reed switch. When coil is energized it creates a magnetic field which causes reed switch to close (or open).
- From sid on 15-03-2012 at 02:43:21
Wow! I am amazed! I never thought that there is a complex and precise manufacturing technology
behind those tiny & cheap reed switches.
One of the many things we take for granted :)