There are many applications where the accuracy of a digital or analogue (bar graph) is not required but something better than a simple low/high indicator is desirable. A battery charge level indicator ...

This LED DC voltage indicator circuit is a voltmeter, rather than simply a battery tester. As such it may measure voltages as low as 3V. It utilizes venerable LM741 operational amplifiers applied as ...

These medium-voltage indicators flash with enough illumination to allow safe viewing from outside the enclosure through an access window These medium-voltage indicators flash with enough illumination ...