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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.
2 thoughts on “HOW TO – Build a home phone-exchange”
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could you do a how to video, I want to do this, but not so bad that I am willing to learn how to read those circuit diagrams