This circuit, which uses a quadruple comparator, was found in old American documentation. The response curve is shown next to the diagram and can be adjusted in the trimpots.
This alarm circuit was found in a 1982 publication. It uses components that can still be found...
This circuit has a voltage gain of 30 times and passband of 14 MHz. The circuit is from the 1974...
This High Side sensor with the L1637 was obtained from a Linear Technology 2005 own manual that...