Suggested by a 1990 book for amateurs, this circuit makes use of an integrated component that is not common today. It converts signals from one band to signals in a 10.7 MHz band below.
This commercial circuit, sold under the designation H531 in Japan in the 1960s, used three...
This configuration can be implemented with equivalent operations. The circuit is from the 1990...
This circuit is designed to identify transistor terminals by means of a selector switch that will...