This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms and excites a load of 16 ohms. The integrated circuit of the time is the PA237.
This is basically the same circuit as the previous one, but using PNP transistors. In the original...
This microcontrolled null adjustment for operational amplifiers was obtained in a Linear...
This circuit is from a documentation from the 50's. The transistors are made of germanium. The...