Found in a 1967 documentation this circuit can be applied to any operational amplifier. Components without values determine the frequency to which the circuit is tuned.
We found this circuit in the August 1994 issue of Electronics Now. The 4046 is unusual today. The...
This circuit was found in a Popular Electronics of the 80's. The NE602 functions as a heterodyne...
We found this chopper circuit in a 1967 publication. The transistors are of the time, and current...