This circuit was suggested by Analog Devices in 1980s documentation. The circuit has a grounded bias and sensor.
This circuit for experimental radios and other applications is from a documentation from the 50's....
This circuit with JFET and Unijunction was found in an ancient American documentation. The...
November 2016 - NXP ARM Cortex microcontrollers for serial interfacing applications, NXP 32-bit...