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Many LEDs, wandering mag fields, and USB juice
Medieval theologians may have argued about how many angels could dance on a pinhead, but contributors to Design Ideas seem focused on driving more LEDs with fewer microprocessor I/O ports. Here we go again, with the latest and possibly last (for a while) entry in the category. This time, authors Nedjeljko Lekic and Zoran Mijanovic show us that “Three microcontroller ports drive 12 LEDs Details... more »
 
The circuit stewpot
Here in the United States, people celebrate late November’s Thanksgiving holiday by cooking a turkey. By the first of December, the leftovers are mostly gone and the picked-over carcass awaits the soup pot. This fortnight’s Design Ideas have already landed in the EDN stewpot, and there’s not a turkey in the bunch.If you’re stuffing a class-D amplifier in your latest product, youR... (more) Details... more »
 
Yet more LED applications, a power sequencer, and an old Design Idea returns
Just when I think that I’ve seen all possible permutations of multiple-LED driver and controller circuits, readers of Design Ideas devise yet another clever method of lighting ‘em up. Based on Atmel’s ATTiny13 single-chip microcontroller, our leadoff Design Idea, “Microcontroller drives logarithmic/linear dot/bar 20-LED display,&#... (more) Details... more »
 
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