This 1 kHz circuit was found in American documentation from the 90s. The original operational amplifier consists of a double 741 at the time. The power supply must be symmetrical.
This circuit adjusts the drained current to values up to 20 A, allowing the testing of power...
This circuit from Motorola is from 1968, appearing elsewhere on this site. The transistors admit...
This watt meter was found in an old telecommunications documentation. The circuit is interspersed...