@tiefpunkt some years ago I built a system to simulate a phone line to demonstrate how room audio from phones was backfed as a surveillance method (widespread in East Germany but possible in other countries), and my "telephone line" used a 24V power supply..
https://www.youtube.com/watch?v=gcq7_JG6oGQ
=> More informations about this toot | View the thread | More toots from vfrmedia@social.tchncs.de
=> View tiefpunkt@social.tchncs.de profile
text/geminiThis content has been proxied by September (3851b).