This circuit was found in the February 1992 issue of Radio Electronics magazine. The circuit provides stepped frequencies as shown in the diagram.
Found in a 1967 documentation this circuit can be applied to any operational amplifier. Components...
This simple circuit was found in the Spanish magazine “Todo Electronica”, in an edition of 1996....
Found in a Popular Electronics from 1992, this circuit uses a PLL567 in an audio meter bridge that...