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Simple Telephone Central Project 2010-09-04

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.
[email protected]


1) System contains 1 subscriber and 1 central
2) Central cannot call.
3) When subscriber hangs up, Central rings.
4) When central answers, ringing stops.
5) Conversation ends when one side closes the phone.

For simplicity you may use an old AT computer power supply which includes
12v and 5v. Have fun.....

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