Using a few diodes and a LED, you can make a nice indicator as shown in associated schematic diagram that can be used for a lot of applications (with a bit of luck). It’s quite suitable for use in ...

Las Vegas, NV (April 5, 2006) – Dortronics Systems Inc. is showcasing custom designed door entry solutions at this year’s ISCW. Among the many solutions offered is the 7201 Series High Intensity ...

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 ...

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 ...

APEM's Dual Icon indicators use green and red filters combined with vivid LED lighting to produce a 120° viewing angle.