This old indicator circuit indicates only when the fuel reaches the sensor level. The integrated circuit is not common today. The circuit was found in documentation from the 1980s.
We have articles on the site with the name “lamp test” for this configuration found in a Popular...
The circuit we present is suggested by Linear Technologies (www.linear.com) and makes use of an...
This current sensing circuit for applications up to 10 A has been found in a Linear Technology...