We found this circuit in the March 1999 issue of Electronics Now magazine. The indicator used is an analog type. The values indicated depend on the calibration.
This simple circuit allows testing of general-purpose diodes and rectifiers and also general...
This circuit not only indicates when the battery is on but also when it is low. The circuit is...
This circuit shows how to add a 1st regulator to a source that already has a step for this...