[sdiy] Top Octave Modular

[Elain Klopke]

>
> There's a difference between "5V tolerant" and "running at 5V".
> 5V tolerant pins can be driven to 5V as inputs, by virtue of having
> special protection diodes.
> In output mode, they only drive to 3.3V-ish.
> You need to be sure the devices you are driving have a high-level input
> threshold sufficiently below 3.3V to register the outputs correctly.
>
>
I think it'll be ok? Maybe? The MIDIbox core board schematic shows a
74HCT541 between the processor and up to 16 daisy-chained 74HC595 chips.

Or the whole thing could melt. But hey, results are results, right?

-Ian
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