Simple telephone central project 2010-09-04

[Wasp]

Wasp submitted a new article:

Simple Telephone Central Project - This simple telephone switching system is designed by Dr. Mustafa Kemal PEKER
for training purpose

This simple telephone switching system is designed by Dr. Mustafa Kemal PEKER
for training purposes. All responsibility is belong to user. Schematic and code is
under GNU public licence. Cannot be used as commercially. If you interested in
with two or more subscriber models with DTMF, please contact to author.
mkpeker@yahoo.com

WORK

1) System contains 1 subscriber and 1 central
2) Central cannot call.
3) When subscriber hangs up, Central rings.
4) When central...

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[Pascalage]

Pls the IC you used. Can u pls explain its function.