The circuit is from the 1990 Motorola Linear Databook. The circuit can be implemented with other operational amplifiers. The power supply must be symmetrical.
This circuit was suggested by Philips in an old publication. The coils, made with wire 14 to 16...
This circuit responds to frequencies from 100 Hz to 3 MHz. We find it in a 90s Radio Electronics....
This configuration is from a 1966 publication. However, with small changes in component values it can...