This circuit uses three inverters to generate a rectangular signal whose frequency depends on R1 and C1. The circuit is from a March 1996 Electronics Now.
We found this circuit in an American publication in 1975. The circuit generates an adjustable...
We found this universal preamplifier circuit in a March 1994 Electronics Now. It has several types...
This filter was obtained from a Linear Technology manual from the 1990s. The power supply must be...