This very high input impedance JFET circuit was found in the 1995 Encyclopedia of Electronic Circuits Volume 5. The JFET is a general-purpose transistor as is the output transistor.
We found this circuit in a 1986 documentation. It is based on TTL integrated circuits that can be...
This circuit was obtained from a 1968 Philips publication. The transistors are of the time. Dual...
This project, found in a 1981 documentation, consists of an interesting adaptation of the test...