Bargraph Challenge

So, we want two 100-LED bargraphs per stereo channel. That means 200 LEDs to drive, and we only have 104 mm × 13 mm of PCB space to achieve this feat of engineering. How do we go about that?

Clearly, we won’t be able to fit 20 LM3914 devices in there…

But there is a solution: a companion board mounted vertically, with LM3914 devices on each side. And which interconnect would we use for that? A vertical SO-DIMM connector of course?

Wouldn’t that waste a ton of vertical space?

Not really, because we already use 21 mm for the faders.



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