If you’re working with 3.3V or 5V circuits, it’s easy for you to throw on a power or status LED here or there. [Tom Gralewicz] has found himself in a pickle, though, often working on projects with ...

The light-emitting diode indicators, positioned just below your HP laptop monitor, report the status of the computer and its hardware. The LEDs can be useful for determining at a glance whether the ...

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 ...

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 ...

The S18DLH and S22DLH high-intensity indicator lights are designed with highly visible LEDs to provide bright, clear indication in environments with high levels of ambient light, including direct ...