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.
This circuit was obtained from a 1966 General Electric documentation. It can serve as a basis for...
This circuit was found in Siliconix documentation from the 1980s. Equivalent operational...
Obtained from a 1980s Linear Technology documentation, this circuit has a hysteresis of less than...