This sensor circuit for currents of the order of nanoamperes was found in an American documentation from the 1980s. The components are from that time.
This circuit was obtained from the component's datasheet, a comparator with voltage reference for...
The circuit shown in the figure is from a time base that generates 60 Hz rectangular signals. |...
This circuit from an old American publication uses a 12 V transformer and an incandescent lamp in an...