HOWTO build a home phone-exchange
Phil sez, "I sent my Dad your HOWTO on building an intercom with an old telephone because it reminded me of something he built when I was a kid. He said: 'Mine was much posher! I made a miniature telephone exchange so that you could dial a specific extension which would then "ring", just like a "real" phone. To cap it all I had antique phones which looked good. The design was from February 1972 Practical Wireless.'" Link (Thanks, Phil!)Share this post
Where not otherwise specified, this work is licensed under a Creative Commons License permitting non-commercial sharing with attribution. Boing Boing is a trademark of Happy Mutants LLC in the United States and other countries.






















