This direct coupled circuit operates in class AB with good gain. The circuit is powered by 12 V. We found it in a Radio Electronics from October 1963.
Found in American documentation from the 90's, this JFET stage has an input impedance of 500 M...
We found this circuit in a 1995 documentation. It can measure frequencies from 100 kHz to over 100 MHz...
This circuit was obtained in a documentation from the 70s. The operational amplifiers used are...