This configuration was found in an English magazine from 1965. It is valid for any junction FET. The input impedance is 5.5 M ohm higher than conventional stages.
This conventional power supply circuit with the LM317 was found in a 1987 publication and its...
This circuit was found in an 80's EDN. The circuit uses a current common CMOS, the 4093 powering...
This detector is from the 1990 Motorola Dataar Databook, but can be adapted to work with more...