This circuit was found in documentation from the 90s. The operational amplifier is NE5514, which is uncommon today. The configuration can be adapted to use modern components.
I found this circuit in a 1992 Electronics Experimenter Handbook. The circuit can be easily...
Found in the February 1990 Radio Electronics issue, this sophisticated 100 MHz probe uses a period...
Found in 90s Popular Electronics, this circuit fires a load through a MOSFET from an audio signal...