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 circuit uses an MW radio tuned to around 540 kHz to detect atmospheric signals, for example, from...
This circuit has been found in an old American documentation and is intended for calibration of radio...
This configuration appears several times on this site. The circuit can generate a 100 kHz or other...