This commercial receiver from the year 1958 uses two AA cells as Power supply. The circuit is intend to receive MW station and the transistors are germanium types not easy to find today.
Found in a 90s Popular Electronics, this circuit interfaces the telephone line with an audio...
This excellent rectangular signal generator was found in a 1989 Radio Electronics. The ranges are...
This circuit was found in the July 1992 issue of Radio Electronics magazine. The circuit is based...