This is one of the many versions of this type of indicator that the reader can find on our website. This is from Mullard's 1969 documentation. The indicator is 95 uA (100 uA).
This micro-alarm was obtained in a 1995 documentation. It triggers a relay when the sensor is...
We found this variable regulator circuit in a Radio Electronics issue from July 1984. It is one of...
In the figure, we show how the integrated voltage comparators of the 139, 239 and 339 series can...