This Hughes circuit is from 1968. Equivalent modern components can be used. The input impedance is 1000 M ohm.
This 2-terminal regulator was obtained from a 1990s National Semiconductor manual. The components admit...
Other operational ones can be used in this circuit that behaves like a precision diode. The font...
The circuit is suggested by National Semiconductor in its 1994 Linear Applications Handbook. The...