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 biestable circuit was found in a Popular Electronics from the 90s. The circuit has an unusual...
This 3-step circuit for generating digital signals was found in the November 1976 issue of Radio...
This circuit for low frequency signals from the Loran guidance system was discovered in the July...