The circuit uses operations that are no longer common nowadays, as it is a configuration obtained in the Linear Applications Handbook of the National Semiconductor of 1994.
Found in an old Elektor, this circuit uses two 7-segment displays to indicate the volume of an...
This resistance meter has a linear scale, converting resistances to voltage. The operational...
I got this circuit from an English magazine from 1977. It can still be easily assembled, as the...