This circuit for analog TV was found in a 90s EDN. The integrated circuits used are from that time and may present some difficulty in obtaining.
Found in American documentation from the 1980s, this circuit uses transistors from that time. It...
E) The interesting thing about this circuit found in a 1985 English magazine is that it controls the...
This wired intercom circuit was found in a March 1965 Radio Electronics. The circuit uses two...