Thread
:
Practical Electronics mag - Telephone exchange project
View Single Post
27th Aug 2022, 5:56 pm
#
7
OscarFoxtrot
Heptode
Join Date: Apr 2011
Location: Edinburgh, UK.
Posts: 805
Re: Practical Electronics mag - Telephone exchange project
AFAICS from the brief description, switching with multiple extensions.
The two telephones with relay logic was described here
https://www.vintage-radio.net/forum/...8&postcount=20
Cook Abbott - Electronics and Wireless World.
OscarFoxtrot
View Public Profile
Find More Posts by OscarFoxtrot