This circuit also appears elsewhere on this site, obtained from other sources. This is an 80's American schematic book. Instead the lamp can be used white high-brightness LEDs.
The circuit shown bellow is gated by an external signal. A high logic level applied to the input...
We found this simple undervoltage indicator circuit in a 1992 publication. The circuit triggers an LED...
This meter has a 0.001% tolerance and was found in an old American publication. The circuit has a...