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Published on Aug 21, 2023


This project is developed for the users to use more than one telephone in the same line with alert.

In one line connection, two or more telephones can be connected in parallel. Usually when one speaks, at the same time other can listen the speech.

But in this project, when one speaks, at the same time if other lifts the handset, it produces a alert tone to the first one. So the first one who is using the telephone can be alert.

When some one uses the telephone, the Electronic circuit is watching all the phones connected in parallel. If anyone tries to listen the speech, the control unit sends signal to the audio section and thus the first one will hear the alert tone.

This set up can be used in industries, institutions, schools, offices and houses which replaces costly EPBAX system

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