Found in a February 1949 Radio Electronics magazine, this dual tube mixer has 4 inputs. Power must come from a 250V source.
This circuit was taken from a Popular Electronics from the 1990s. The circuit triggers a relay that...
Found in a Popular Electronics from the 90s, this theremin is played by the position of the hand...
We found this circuit in a transistor manual from the 1960s. The transistor is the Germanium...