There are still sane people here, we just don't talk about "rocket man" because it enrages the particular subgroup on display here and usually goes no where actually productive (and has like a 50% of getting flagged to death anyways). I'm not pro Elon by any means, but the standard HN profile of him is pretty bat shit crazy.
no he and his stuffs are now considered transparent, no pun intended. I think he deserves it since his minions were persistent with usage of "this ___ has hateful bias against ___" canned response.
Microsoft Kin was a separate thing, and was discontinued 48 days after launch.
Windows phone had excellent hardware (from nokia) and excellent UX, but very few apps bothered to support it. If my old windows phone was still updated and my critical apps supported it I'd still be using my lumia 800/900 series phones.
>then I needed to find a brake controller that can work with the higher voltage (14.4v vs the normal 12v)
Put a voltmeter on the battery terminals of a regular car at 2000rpm and note the voltage. You'd be surpised (the alternator can produce as high as 15V on some cars).
Automotive transients can be wild. I did a bringup with a board that had specified 100+v range specified for transients and finicky quality requirements on the output. The power supplies took up most of the (very large) board.
14v is not a transient, if your voltage was 12v with the car running, there's something wrong with the charging system (DC-to-DC in an EV, alternator/generator in an ICE)
13-14v is normal in all 12v automotive systems as the charging voltage
If I recall correctly, a fully charged lead acid battery has an open circuit voltage of 13.6V.
So the alternator has to put out at least something higher than if it’s planning on recharging the battery after 500 to 700 amps have been pulled from it for a few seconds to start the engine.
Yeah, max CV charging voltage is ~14V, max charging C rate is ~0.2C, open circuit voltage at 100% is that 13.x range. And lead acids like to stay at 100% unlike Li-ion which likes 50% +/-30%, so "12V" ICE cars just use a bus voltage of 13-14V and wire the battery there. At any given moment, the car's "12V" bus voltage MUST be above 13.x and below 14.4(absolute max).
It's a bit perplexing that those lead acid systems are referred to as "12V" systems when that figure is effectively the 0% voltage, whereas 3.7V for single Li-ion cell is the 50% voltage.
e: also, ICE transients can be in kV range, coming from ignition mechanisms. I've heard that you can literally measure engine RPM by selecting 1/dt on an oscilloscope and dividing that by cylinder count.
The nominal range for automotive systems is 10-16v. If you are designing anything for automotive use that doesn’t work reliably in that range, you are manufacturing problems for people.
This. Most cars nowadays come with the so-called "smart" alternators that vary voltage wildly depending on the current driving conditions.
One minute you might be accelerating and the onboard voltage drops as the battery supplies most of electricity. Then, as you reach the crest of a hill and start engine-braking, the car frantically tries to convert all the available kinetic energy to electricity, raising the onboard voltage to quickly charge the battery.
>This. Most cars nowadays come with the so-called "smart" alternators that vary voltage wildly depending on the current driving conditions.
Which in practice means that they do a very miserly job charging the battery and are a ton more sensitive to a battery being in less than tip top shape so you can expect your battery lifetime to go down.
But it's a "win" because they pushed the serp belt change outside of whatever interval the reviewers who calculate TCO care about and they saved .000003mph in the process.
nit: Some vehicles can use a two stage charging system where if the ECU is not trying to charge the battery and the power draw is otherwise low, the voltage sits in a lower range rather than constantly float charging the battery. This can surprise you if you're trying to diagnose a battery issue!
Yeah, this is normal. When the battery suddenly disconnects (for example of the lugs pop off) the alternator's momentum will send a massive, long-standing transient on the bus up to 100V. This is called a load dump.
Saw up to 800A on units like the FSD for the short time until the caps were full. Slow starting a SoC is a software problem, slow starting the Cs and keeping the impedance low at the same time a non-trivial hardware problem.
I typically fault anything above 15.6V as “that’s a bit high, your alternator might be on its way out” when working on automotive / caravan / camper van appliances and accessories.
There was a brief period of time where you could buy your car like this. You'd purchase a rolling chassis from one manufacturer, and commission a coachbuilder to put a body on top. Many premium brands such as Bugatti, Rolls-Royce and Jaguar (Swallow) started in this fashion.
Today, outside of a few niche areas such as motorsport and commercial uses such as buses and coaches, nobody buys a vehicle this way. If you walked into your local Ford or Toyota and asked for a rolling chassis they would look at you as if you were insane, and rightly so. Integrating the development of the chassis and body into a single unit (both philosophically and literally [0]) has given us cars which are lighter, faster, more efficient, more featureful and safer by every measure.
We had our coachbuilding period in personal computing and it's all but over[1]. Nobody asks for the hardware and operating system to be sold separately for their washing machine, their TV, their microwave oven or Tesla EV. And yet for some reason some still cling to the idea that tablets and smartphones are personal computers rather than recognising them for the appliances they are.
As Steve Jobs allegedly said, design is not how something looks, design is how something works. How a feature works on a highly evolved device like an iPhone is a function of tightly coupled and carefully designed hardware and software.
Having this design process take place in different teams inside different companies, selling in different commercial models would not lead to a better outcome, it would be worse, much worse. The staggering commercial success of both iPhone and iPad is all the proof you need.
