A Home Made PBX
5 hours ago
- #DIY Telephone System
- #Nostalgia
- #Electronics Project
- The author built a custom dial telephone system in 1992-93 using components from Bell-Northern Research and garage sales.
- The system features various functions like call holding, speed dialing, call forwarding, and ring pattern customization.
- Key components include relay-based line circuits, a digital tone generator, DTMF receiver, and DAC for tone generation.
- The microprocessor manages tones and ring voltage with precise timing to avoid clicks and reduce relay wear.
- The system was built for entertainment and educational purposes, not practical use, satisfying a childhood fascination.