This circuit was found in an American publication from 1965. The circuit uses components from that time. No information was given about the excitation transformer. Observe the high input power.
Found in an 80's Electronic Design, this circuit is based on the ICL7107 which is not an easy...
This circuit is used as a magnetic field sensor and is based on a Texas Instruments HaII Effect...
This circuit was found in a Japanese documentation of the 70's. It uses transistors of the era and is...