This circuit was found in an Electronics Now of the 80s applying to NiCad batteries of the time. The circuit is powered by a 12 VAC source, for example, the secondary of a transformer.
This circuit was obtained from a Linear Technology manual from the 1990s. The sensor is of the...
This circuit for VCR recording heads was found in the February 1990 issue of Radio Electronics magazine....
The integrated circuit used in this project is not common today. It was found in a 2000...