How do sound powered telephones work?

Sound powered telephone communication technology uses electro-mechanical transducers which enable audio communication over a single wire pair without the use of external power or batteries. The sound pressure created from a user's voice when talking into the transducer is all that is required to power the system. read more

Sound powered telephone communication technology uses electro-mechanical transducers to provide audio communication over a single wire pair without the use of external power or batteries. The sound pressure produced when a user talks into the handset/headset transmitter generates a voltage that is sent to the receiver which converts it back into sound. read more

Sound powered telephones are also used in many commercial/industrial locations such as: airports, fire and police rescue crews, public utilities, schools, vaults, refrigeration plants, civil defense, bridge installations, ski slopes, oil fields, parks and forest, railroads, salvage yards, sporting arenas, shipyards, diving projects and geophysical operations where power is not available. read more

Many different types of equipment have attempted to replace sound-powered telephones on ships; however, due to the rugged, reliable and power-free nature of this form of communication equipment, it is still in use on all U.S. military vessels, commercial vessels and work boats. read more