This circuit was found in a 303 Circuits issue of Elektor magazine from the 1990s. The circuit uses an equivalent operating system. The source is not symmetrical.
This circuit is from a 1976l filter cookbook. The circuit has a factor Q = 3, and must be supplied...
This amplifier was suggested by the Texas Instruments linear applications manual of the 90s....
The circuit shown in the figure is suggested by National Semiconductor and is based on an...