This high quality circuit with complementary symmetry was found in an Electronics World of 1966. It can be made with modern transistors like the BD or TIP series.
The HA2620 integrated circuit used in this comparator is from the 80's, but the setting can be...
This circuit uses the Linear Technology LT6505 and was found in a 2005 manual. The circuit is for 24 V...
This interesting circuit of the American publication Electronics Handbook Volume XIII 1993 shows a...