This circuit was found in a 90s American publication. The same configuration appears in several places on this site, obtained from different sources. The lamps can be replaced by LEDs.
The circuit shown was taken from an American 80s schematic. The circuit indicates when the battery...
This passive circuit was found in a 1993 Electronics Hobbyst Handbook. The circuit has the...
Mouser Electronics has in stock the Texas Instruments TPS7A90 Low Voltage Dropout (LDO) Linear...