Comments by "Stephen Villano" (@spvillano) on "DENKI OTAKU"
channel.
-
13
-
3
-
3
-
It looks like there's some HF noise in the lab. Judging by the spikes on the oscilloscope, I suspect either light switching spikes or more likely cellular phone interference nearby, around a few meters away.
Also looks like the 'scope leads might be near a transformer or they're growing resistive in the shielding, as there is a LF ripple apparent.
You covered etching of the foil nicely, many classes on electrolytic capacitors omit that critical fact.
I'd probably have gone lightly into inductance in capacitors, especially electrolytic capacitors, just to be thorough on design considerations and a small ceramic or mylar cap to counter ringing.
Haven't worked in electronic circuit design in decades, nearly forgot about frozen electrolyte. Good to remember if I ever design something for arctic, high altitude or space usage. Unlikely, but in my life, the unlikely occurs far too frequently.
Back when I was working as an electronics technician, I worked on everything from vacuum tube analog, germanium transistor analog, silicon transistor analog, discrete IC analog, VLSI analog and digital circuits. I work in IT now, but still remember my electronic theory well, which has saved my bacon on more than a few occasions.
Knowledge is power! And equally important, useful.
3
-
3
-
3
-
2
-
2
-
2
-
2
-
2
-
1
-
1
-
1
-
1
-
@d614gakadoug9 yeah, that could either turn expensive or expensively entertaining, rather than enlightening.
Entertaining, if it's only the reference legs on a wheatstone bridge wandering in value randomly. Expensive, if it's measuring production or providing a reference bias... Well, unless one's goal is to, rather than turn out a flat and true product, produce a funhouse mirror. ;)
Sounds only minor, until one considers the difference between a non-precision automotive bearing and a high speed turbine bearing. Then, wobble shakes things apart and lateral runout can turn a stator into fragments as the rotor tries to convince it to joint it in its motion.
Did you ever look at what's required for use in space? That's even tighter, due to thermal, oxidative effects of the rarefied upper atmosphere and radiation effects, to name a few variables (not to mention no free oxygen being permitted in anything, especially insulators). Worked briefly with that, boy, but the requirements were demanding, exacting and absolutely necessary.
Or, in the case of the Mars rovers, one EE asked, "Do dust devils possess an electrostatic charge?". Everyone he asked didn't think so, but couldn't find any reference. So, he made a trip to the desert with some instruments and was horrified to find tens of kilovolts accumulating within dust devils. That necessitated a complete review of rover circuitry. The finding being, as initially designed, the rovers would've failed catastrophically on first contact with a dust devil.
Now, they're optical cleaning events.
1