The circuit is from 1994 National Semiconductor documentation. The component is not easy to obtain, but there are equivalents that can be searched.
This circuit was obtained from an American 80's documentation. The operational ones can be...
This circuit uses two Raytheon RC4558 operational amplifiers that are similar to the 741. The...
This configuration for 3 A currents with a maximum input voltage of 30 V appears elsewhere on this...