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 circuit consists of a constant current source for charging 12 V batteries. The charge is...
This simple neon lamp power indicator circuit was found in the January 1971 Radio Electronics...
We found this sophisticated meter circuit in an article in Radio Electronics magazine from June...