HOW TO - Build a home phone-exchange

Withphones
Markus writes - "This miniature, 8-line home telephone exchange (PABX) works with standard telephones and features high-quality, user-friendly progress tones. Connection to telephones is via a two-wire unbalanced loop with a common ground. Only pulse dialling is supported although the exchange could be adapted to use a DTMF tone decoder." Lots of schematics and photos - [via] Link.

Previously: HOW TO - Use old telephones as an intercom - Link.


Posted by Phillip Torrone | Mar 5, 2006 04:26 AM
DIY Projects, Electronics, Telecommunications | Permalink | Comments (0) | Email This | Bookmark and Share | Digg this!


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