Found in American documentation from the 90's, this circuit applies to other operational amplifiers. The frequency can be changed by changing the components.
This simple audio signal tracer or follower can be made with a BC548 instead of the original...
The circuit shown in figure 1 is a suggested application for ISL8107, a new integrated circuit from...
This notch filter or reject filter rejects signals of a certain frequency with good selectivity. The...