This 3-digit digital gauge was found in the July 1900 issue of Radio Electronics magazine. The circuit is based on the CA3161 and CA3162 A/D converters of the time.
Found with variations on this site, this circuit was taken from an American documentation from the...
This wide-range radiation monitor was found in a 1980s documentation. The circuit uses a diode as a...
This circuit was obtained from an Electronics World magazine from 1992. The circuit provides an...