An analog telephone line simulator built (almost) entirely in CMOS and through-hole parts. It will be the second of its kind designed entirely in the 21st century, and the first of its kind designed in the 21st century with any hope of other people reproducing it. Think of it like a rudimentary PBX you can build at home, or like a little telephone company that sits on your desk. Either is accurate.

Realized today why my filter circuits weren't working as they should: I screwed up the placement of one capacitor when I moved the design from simulation to schematic. Next post in the series coming soon.

https://hardfault.life/t/tinytelco