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

HI-FI Stereo Encoder / Multiplexer
Linear scale ohmmeter
Digital Pressure Gauge
Adjustable Timer
LC meter
discussing output stage of square wave
Light Dimmers Projects & Circuits
Automatic 12 Volt Lamp Fader
6N7 Tube QRP Power Amplifier
3V Supply Splitter
Double tube fluorescent emergency circuit 2



Top