Found in an old Xicor documentation, this circuit makes use of an X9241, which contains four digitally controlled analog potentiometers.
This circuit that equipped many transistor radios from the 50's was found in an American...
We found this circuit in a 1960 Radioarama magazine. The instrument tests common general-purpose transistors...
This circuit appeared in the November 1995 issue of Electronics Now magazine. The circuit uses...