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 ...

Designed to replace incandescent or neon indicators in applications where shock and vibration can greatly shorten lamp life, or where lower power consumption is needed, a line of panel-mount LED ...

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 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 ...