Two way Simple Very Small Telephone Exchange


Posted on Feb 5, 2014

This is a very small telephone exchange attached only two ordinary Tele phones. Fully bi-directional facility with an intercom system. When a phone is in off hook condition, Exchange will detect it & send ringing pulse to other phone. When it will be picked up, the connection will be established between both phones. This will be taken place vice


Two way Simple Very Small Telephone Exchange
Click here to download the full size of the above Circuit.

-versa. This circuit is base on PIC16F84A microcontroller. Two slimier SLIC are connected to The controlling unit. It needs to identify following connections on the controlling unit circuit diagram. This unit is required to detect every status from an usual telephone set for the Controlling circuit ( Exchange ). It interfaces an usual telephone to the controlling circuit. Two slimier SLIC are required for this project.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Automatic Bell AT89S8252
Telephone Visual Ring Indicator
Frequency Generator Counter
using programming pods at the in circuit test stage
Car Battery Charger12V circuit and explanation
20 Watts Car Stereo Amplifier Using TDA2004
Thrifty 2Hz Clock
Spark Gap Experiments
Function Generator



Top