A selection of tiny clocks, sync’d a variety of ways – by hand or by (S)NTP/chrony. Featuring Raspberry Pi Pico, ESP32 and micropython.
Bringing an old analog (1G) Cleartone CTN9000 mobile phone handset back to life with the aid of a software-defined radio (Lime SDR) and osmocom_analog.
An app written in 1996 to simulate making voice calls from a Psion Series 3a.
One of the many promises of 5G is accurate time-transfer. I spent a couple of days travelling around the North West of England testing exactly how accurate available time transfer was from commercially deployed 5G installations.
A long time ago I built a VOIP PBX. I’ve been wanting to build & use another for a long time and finally got round to it with a £10 Cisco phone and £14 USB dongle…
Adding MF4 (DTMF) dialling capabilities to the legendary Psion MC400 laptop from 1990
Reviving some 1990s era tech …