Telephone exchange from scratch

Various DIY telephone exchange machines, large and small

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How many stepping switches are needed to route calls between old rotary-dial telephones? Let's see.

How many stepping switches are needed to route calls between old rotary-dial telephones? Let's see.

Want to install a machine telephone exchange into your hackerspace? It's for you.

By the way, there is an long read article for the International Journal of Proof of Concept or GTFO issue 21 waiting for its readers.

There is another article on single page specially crafted for PagedOut magazine lead by Gynvael Coldwind. I hope he will recover from disease and publish it eventually.

  • 1 × Stepping switch of any kind
  • 2 × Relay with 24V coil
  • 16 × Various 12V relays for logic circuitry
  • 2 × Power Transformers
  • 3 × Fuses in various places

View all 8 components

  • Log #2: POC or GTFO article is out!

    dearuserhronan hour ago 0 comments

    Two good news.

    1. The International Journal of Proof of Concept or Get The F... Out Issue 0x21 is now available in PDF format (pocorgtfo21.pdf) for everyone who is interested. This is a masterpiece collection of articles on computer security, hacking, reverse engineering tricks and such stuff. There is something that makes me tick about this magazine. I am trying to read each article very carefully, and I was really waiting this issue to come out (especially knowing that it will contain long read about phones). - see contents of each issue of this magazine - main mirror

    2. The Cadr-o-station device is now have new home - it is now part of b4cksp4ce hackerspace in Saint Petersburg, Russia. The space inhabitants are now trying to make use of it and add missing features to it. Good luck, guys.

  • Log #1: Watch THIS

    dearuserhron09/03/2021 at 19:06 0 comments

    This is CADRSTATION. Special purpose old landline phone exchange for small households and hackerspaces. It requires only one rotating stepping switch. There is a difference compared to other exchanges: here all telephones are connected together all the time and talk to each other in a big multi-conference style. The rotating switch is used to send ring signals. Optional external connection to the city phone socket is planned.

    It bears CADR hackerspace logo, because it was assembled and tested there.

    And here is schematics (ask me, I will tell you more):

View all 2 project logs

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0xCAFEAFFE wrote 12/12/2021 at 19:47 point

this is insane! i fucking love it :D

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