This resistive sensor was found in a 1969 US documentation. The circuit uses transistors of the time, but current equivalents can be employed.
This circuit is from the 2005 Linear Technology Sensor Manual. The circuit is fast acting and has a 3 V...
This configuration was found in an English magazine from 1965. It is valid for any junction FET. The...
This circuit was obtained from a Radio Electronics issue from January 1989. The indicator is a...