Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
This electronic flash circuit was found in the March 1961 Radio Electronics magazine. The circuit...
Like the previous circuit, this is used in the analog part of the telephone lines. The same...
This circuit was found in documentation from the 90s, being indicated for use with tape recorders given...