The input and output frequencies of this circuit depend on the coils and capacitors of the tuned circuits. The circuit is from Electronics Now magazine, February 1997.
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...
This interesting circuit, found in an old American publication, measures alternating signals in a...
This is the well-known lightning lamp that was published in the March 1988 issue of Saber...