Reed sensors in Telephone Handsets
Even though the telephone was ubiquitous in the 80s and 90s even every home or office, it has been replaced with cellular phones or smart phones. Offices though, still continue to use desktop telephones which use handsets and hook switches. This makes it easier for higher level management to get connected on external calls by their secretaries or receptionists as well as internally, via an intercom system, to a PBX or a private branch exchange.
These telephone appliances, make many calls a day and the handset is placed back on the base station when hanging up a call. To avoid static when using mechanical switches in the base station, handset designers use normally closed reed sensors on the base station, with a magnet on the handset. This also helps remove the noise of the handset being placed on the base station and the user at the other end always gets a silent ending to a call.
When the handset is taken off the base station, it closes the normally closed reed sensor and enables dialing circuit. In the case of wireless handsets, the same sensor is also used to trigger the charging circuits.
Recommended Products
The Reed Switches and Sensors used in such applications need to be robust, durable and efficient in meeting a high life expectancy. Our engineers work hard in life testing our products under various conditions, and we want to ensure that the the end product has a long working life. Although we wouldn’t want to restrict our products for use in only certain applications, the recommended products for use in telephone handset and hook applications are listed below.
R5B Ultra-miniature Normally Closed SMD Reed Sensor
 | Click thumbnails to view actuation distances Highlights ♦ Normally Closed form B contact ♦...Continue reading |
R2B, Normally Closed, SMD Reed Sensor
 | Click thumbnails to view actuation distances Highlights ♦ Normally Closed form B contact ♦...Continue reading |
IL-2022 Reed Switch for Inductive Loads
 | Features Release AT Configurable. Ruthenium contact. 20.0 mm Glass length. Normally Open. Inert gas...Continue reading |