/diy/ - Do It Yourself

>>1792287
solid

>>1792308
the trigger for a triac is usually referenced to a particular main terminal. for true ac operation you'll want a phototriac-based optoisolator like MOC303x/304x to replace the FET/resistors

>>1792387
custom interfaces to the material world, which is heavily flavored with applied physics. literally everything else can be bought

>>1792431
what's so hard about Vo = (V+ - V-) * Aol
I mean, that's it, aside from weird implementation details and out-of-spec operation: they basically try to make V+ = V-, solving whatever equation you throw in the output feedback loop
Nuts and Volts did a couple of series on them in the 2000s. one for regular opamps and one for OTAs. they might have even done one for Norton opamps. PDFs are available for download

>>1792445
USB 3.0 is different physically and electrically. the speed increase requires even better length and impedance matching in the pigtail from panel to motherboard