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Subject: Converting Four Wires Intercom Circuit keeping the same Sound Quality

Date: 02/25/02 at 7:05 PM
Posted by: Waqar Zaka
E-mail: wzaka@yahoo.com
Message Posted:

Please do mail me about the following questions:-

1) Firstly is there any circuit diagram avaiable here which can be use to make a simple intercom system home intercom which works on two wires with sound musical sharp sound bell. Like for making good sound we need to use four wire , what is the theory behind this. 4 and 2 wires.

2) Is there any website from where i can get information about making a simple PABX, private automatic branch exchange.

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