My Homemade PBX
Summary
This article documents a detailed DIY eight-extension dial telephone PBX built in the early 1990s, covering analog line circuits, DTMF/pulse dialing, a digital tone generator, and a control processor. It emphasizes hands-on hardware design and firmware notes, offering educational insight into retro telecom engineering. Useful for readers interested in hardware hacking, retro tech, and the engineering journey behind a standalone PBX.