Hah. I'm not any kind of engineer. If you feel like it, I'd be appreciative of any evaluation you might have for what I came up with and how I came to rationalize it.
I wanted the thing to be as quiet as possible at all times, and to always minimize the ways in which it can annoy.
Fans, as frequently implemented, are often annoying. They're often noisy all of the time because they lack controls.
Sometimes, they have dynamic controls that suck. Like a Juniper switch that runs the fans at a screaming 100% that you can't have a conversation near during its minutes-long boot process, and then quiets down to only a dull roar (but never any quieter).
Sometimes they suck in other ways: It starts quiet, but then it ramps up in audible quantized steps as cooling demands increase. The very definition of these steps is distracting.
Sometimes, they're just too responsive to be tolerated in the company of humans. The fan speed is always hunting and changing the pitch of the noise it produces, and sometimes this adjustment happens at a discernible and very regular interval that just makes it maddening to be around.
Sometimes, they're arguably even worse than any of that: The fan cycles on and off. It is a jet turbine, or it is silent. There is no in-between.
Sometimes, they're very clever in the worst ways: They ramp up instantly in response to dynamic events, and then slowly wind back down. That's awful in a power amplifier but it happens anyway, wherein: Every loud amplified sound is punctuated by the dying roar of a fan, even when the dynamic event was actually a short-lived nothingburger.
---
Anyway, this one is buttery-smooth. It responds to temperature on a curve. It has no perceptible steps as speeds increase or decrease. It's deliberately lazy and smoothed-out in its response; this amplifier has several pounds of aluminum heatsinks so instant response just isn't ever useful, and it's also least-annoying to deliberately eliminate rapid speed changes altogether.
The fan is a big Nidec screamer that I got from a late-century, grossly-overbuilt Dell Precision desktop. It can reliably spin so slowly that it's essentially silent (as is useful for an engineering workstation like that Dell), and it can also move enough air to fly itself right up and off of the bench.
The controller automatically finds the minimum viable speed for the installed fan, so it avoids being stalled at low duty cycles. In this way, some air is moving regardless of which make/model of 4-wire PC-style PWM fan is used down the road, making potential bush fixes more practical and functional. (It also does stall detection and recalibrates if that's ever necessary for some reason.)
And there's no lookup tables, because lookup tables imply steps and steps are bad. Besides, I'm not trying to save a million nickles on a million units here; shaving pennies isn't part of the program and a single $3 MCU board is cheap for my [qty. 1] application, so that what it gets. By extension, it has way more than enough grunt to get everything done and it just computes it all over and over again.
Like the output %, which gets rejiggered at a rate of 1KHz: I could have probably been happy with 100Hz. Or 10Hz. But the MCU is already chosen and it can do 1KHz just fine, so... that's what it do. It doesn't matter that it is inefficient; efficiency wasn't a goal. :)
And, because it's vibe coded: Of course this big rack-mount power amp from 1986 has a wifi-accessible web interface for its cooling system. It seemed like a pocket computer would be best way to provide a way to twist some of the cooling-related knobs when used in the field, since this is a functional prototype that sometimes gets used in literal fields. (It was dead simple to to get the bot to put that part together. The networking stuff might have been the easiest part.)
thankfully we will have a competing frontier model from the next lab shortly I'm sure and I hope they are reading this feedback and swing theirs the other direction.
As far as I can tell, there's no minimum period you have to wait after an IPO to be able to short shares. Legally, you can do it from day one.
And instead of a classic short where you have to borrow the stock, you can also write single stock futures. Futures don't require you to borrow the underlying. You just need enough collateral, but that can be anything, like T-bills or whatever.
Or you can write call options, or buy put options, to bet on a falling stock price.
My medication is billed as "thousands per month" but the insurance company pays a different rate than the 'billing' rate and all I pay is $20/month for my biologic infusions. If I didn't have insurance I could enroll in the drug program and get it nearly free. I think its really very rare for the case you mention.
AFAIK, Electron holes refer to the P-type charge carrier in a semiconductor lattice where the absence of electrons behave similar to electrons in an N-type semiconductor. Benjamin Franklin was not concerned with solid state physics rather he's referring to the charge carrier in a conductor being positive when we later discover that its negative (electrons). When current flows through a conductor its just electrons (not holes) moving from negative to positive.
So it's significant in that these aren't toy devices, they fit in a very similar place in the engineering ecosystem as conventional wind. They should be a real competitor.
Are you really comparing a single experimental turbine's handwaved output with the consumption of an entire state with a population as big as the bigger European countries?
I never found it so, as going through "liberal" media I tend to see far fewer lies than I do when I wonder over to the world of mainstream conservative news.
