Suggested by Siliconix in documentation from the 90s, this amplifier has its gain digitally selected. The components are from that time, not easy to find today.
This 10, 25, 45 second and 5 minute timer has its times selected by the switches. The circuit...
This sensor circuit for currents of the order of nanoamperes was found in an American...
This HeNe laser power supply was found in the March 1989 issue of Radio Electronics magazine. This...