We found this circuit in the Linear Applications Handbook of the 1994 National Semiconductor. The transistor must be a high voltage type and the LM3900 power supply must be symmetrical.
This circuit was obtained from a Radio Electronics from October 1963. The 4 transistors must be...
This shield circuit is from an American documentation from 1969. The components can be modified...
This circuit for very low frequencies was found in an American documentation from the 90's....