Anybody know what's up with WOW Airlines? Do they charge $50 for a cup of water once you get on the plane or what?

Cause otherwise their fares are like 1/2 what any other airline offers from SFO to Europe.

@ThePhoton they're an European LCC (and based out of Iceland, of all places)

@Shalvenay Icelandair used to also be a low cost way to get to Europe if you didn't mind a stop-over in Rejkjavik. I guess they must have collapsed in the financial crisis and been reborn as Wow?

@ThePhoton Long flights are supposed to have free water and snacks/meals (number and size depend on flight time) by regulation, don't they? I'm not 100% sure though

@ThePhoton no, you get plenty of water for free, but have to pay $50 for using the lavatory

Device costs € 5020. Branch Manager: We need this, it works, is that okay? Project Manager: That's okay, but need to ask CTO. CTO: That's okay, but needs to be approved by CFO. CFO is out this week.

Device Costs € 4999. Branch Manager: We need this, shall we order one? Project Manager: Yup, buy. Fine. Do it.

numbers are cool

@PlasmaHH Depends on the temperature scale

Réaumur ?

No, those are notably hot

Rankine would be the coolest numbers I think

delisle is, uhm, intresting

@ThePhoton no, IceAir is still going strong -- WOW's just a competitor in that market

@PlasmaHH That's one word for it

@Eggi And you assume that everything to do with dual layer design has changed since then, because?

@Asmyldof I am assuming that there must be some additions around.

@Eggi HV and 10A at up to 80MHz I find noteworthy as a 2 layer design in and of itself. You should really consider going to 4+ layers for that kind of work

I recently had the scenario, where an µC sends data to an isolator, which is in double supply mode and when I measure between isolator and µC the Signal changes, 19pF probes. I am really struggling with such problems.

electronics.stackexchange.com/q/289862/11684 -- it drifted, but it originally came from the sick to your stomach feeling you get when a key piece of hardware fails to start.

@Eggi There are so many possible reasons for that it's almost impossible to start debugging with only that information.

In many ways the same goes for EE "how to's "

The one you linked is a good start, with what you learn you can search here and on google and find newer ideas and updates to things that are relevant for you

It's virtually impossible for me to tell you what will be relevant, because I have no basis to judge relevance in your place

@Asmyldof This is where you go ask the guy selling the Eu5020 one for a price break.

@PlasmaHH If I start an airline someday, I might want your resume.

Hm, 15 minutes at home, already the third us military chopper flew over my house... Anything I need to know?

@ThePhoton Check Kickstarter to see if they've got a crowdfunding campaign for the airliner maintenance.

@ThePhoton Nope. Because we are months, if not YEARS beyond the point I care

@Asmyldof For us, $5000 and up is "capital" and less than $5000 is "expense". Different budgets for each. There's been times I've had to add extra options or whatever so that something could go on the capital budget instead of expenses. (Maybe I should have just asked for pricing in Euros)

* shrug * everything is over managed and the effect is my craps have all been given

25 EE's, 6 Altium licenses....

@ThePhoton I remember the good old days (up to a year and a half ago) that that worked just fine. Even just one license

late night breadboarding... when using a silicon for D3 it gets hot when I connect R6 (load) and when I use a shottky, it gets hot when the load is not connected... what am I missing here?

@PlasmaHH Grab Bag schottky?

Schottky have higher reverse leakage, which gets worse with temperature, so if Vout is somewhat high and the Schottky happens to have appreciable leakage, the combination of forward bias current and reverse leakage may cause thermal runaway

@Asmyldof all kinds of shottkys from my used parts bin, various qualities, tried a few... yeah I thought of reverse leakage too but didn't think it should be that bad, but probably is...

Also without a load, even if the reverse leakage is low on the Schottky in principle the output voltage could get high enough for near-break-down, creating the reverse leakage you want to avoid

If you want high voltage at the dozen mA range, you may want a fast switching diode rather than a standard schottky

so I need a shottky with high voltage rating (best probably 60V in this case to be sure) and low leakage... doesn't sound particularily easy...

Don't feel like looking up the IPU FET, but if it switches on enthusiastically, a slow turn off may also create a lot of heat and loss of output power

the FET is one thats moderatly similar to the one I use, it doesn't get hot at all

I'm not talking about the fet getting hot

any typical diode that might be in a used parts bin that you have in mind?

If the FEt takes 20ns to turn on, and the diode 2us to turn off (let's say, it's unlikely, but examples), the reverse loss in the diode may also become appreciable

....

Nope

lol I feel much less guilty about macgyver'ing a boost converter from a 555 now that one time

(and before you judge, it ran the computer off the stack of AAs taped together just fine)

was it at least a bipolar one too? ;)

haha in behavior? or supply rails?

the die technology. bjt or cmos

I'd have to check, I think I used an LM or an NE?

@Asmyldof indeed just using a 4148 did the trick, I always forget about diode switching speed

or if you meant the power mosfet, it was some old HEXFET

na, the 555 itself

@PlasmaHH :-)

I'd have to check sorry, uh... I'll let you know if I find the remains of the device to check

Is a bit more low power than I would have taken, but at 20mA it may work just fine

was the first pick from the small signal diodes box ^^

I was surprised that it worked at all, let alone with 50W load lol. I sorta just haphazardly made a shitty error "integrator" with a capacitor, a resistor to V+, and a small small transistor to discharge it, and a non-EE friend soldered it together by hand without knowing a damn thing about what he's doing. I actually didn't believe the board implemented my schematic until I traced each wire out from the uninsulated solid metal hairball that perfectly explained the design quality

@MickLH You can hardly call a HEXFET old when you're using it with a 555.

@ThePhoton lol I just meant "old" in the sense that it had been laying around for a while and there was no sign they will get used again

the other day I designed a buck converter on paper with a 555 that had 97% efficiency, using 0.01% accurate components ;)

lol oh thank god, ok I'll come clean, I refined that design for like a week after

with the restriction of not increasing cost lol

also with the restriction of not just using a boost control chip

It started as a joke about "some of the shit you find inside cheap asian PSUs"

I love finding local newspaper

@MickLH As long as it's UL 94V-0 rated newspaper.

@codinginsane How would I know? Ask the datasheet! ...maybe it has an output buffer and can only achieve full throughput if you buffer a few samples before reading them out, doubt it but seriously just check the datasheet

They should reliably and exactly tell you what you can get out of it, by doing what, and how often / when