4/6/2024 0 Comments Side tone settingsThe carbon transmitter does not produce any e.m.f. It is the property of carbon that its resistance varies with pressure. The constructional details of the carbon transmitter, is illustrated in the figure. It is based on the principle that the resistance of carbon granules is inversely proportional to pressure. We will discuss the carbon granule transmitter only. There are different types of transmitters but carbon granules transmitter is the most widely used in the handset of the modern telephony. It is a transducer, which converts sound energy into electrical energy. Microphone in telephony is regarded as transmitter. Block Diagram of Telephone Set Circuit Diagram Of Telephone SetĬircuit diagram of subscriber's telephone set Telephone Set Transmitter Carbon Granule Transmitter A simplified circuit and Block diagram of the telephone set is shown in the figure. The exchange determines that whether the telephone is idle or busy or initiating a call by monitoring the dc current. An electromagnet, called the ringer is connected to the telephone line on the exchange side, so that a ring can be received from the exchange when it is called. In this position it opens the switches and disconnects the handset from the telephone system. The handset is placed on the cradle when the telephone is not in use. The instrument, which contains the microphone and the receiver, is called handset. Switch connections to the telephone system.The subscriber telephone set consists of the following parts:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |