Both the operational amplifier and the diodes admit equivalents in this circuit suggested by National Semiconductor. The power source must be symmetrical, and the circuit curve resembles an ideal diode.
We found this circuit in a 1974 integrated circuit manual. Operational amplifiers can be of...
We found this circuit in American documentation from the 1980s. Transistors can be of general use....
This sophisticated remote field strength meter circuit was found in a 73 magazine for radio...