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Casio-F-91W die-shot

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Re: Casio-F-91W die-shot

#141

Post by Tor3 »

smackeyacky wrote: post #59
Tor3 wrote: post #25

Earlier quoted context omitted.

At around 1976-1977 I bought one of those fancy new LED wristwatches, where you pressed a button and the time lit up in red. Straight out of James Bond, as I recall. As I was studying electronics at the time I brought the watch to the lab and opened it and connected a frequency counter to the oscillator, you could clearly see the crystal and a little trimming pot (I don't remember by now if that was a pot or somethin…

Get a Casio G-Shock. The 800 models can sync with your phone and the time is auto corrected. I bought a GBA-800 from a pawn broker - out of the dozen or so watches in my box it's the one I reach for if I have to know what time it is accurately.

I just checked the price for one of the digital G-Shocks.. I could buy a car for that! A used car, at least. So no, I'll stick with the cheap digital Casio I already have, even if it's a couple of minutes wrong today (it's a bother to adjust them all the time). At least I don't have to worry about one thing: Battery. It seems to run forever. I think the battery was supposed to last 7 years, but by now it's been twice that long. The backlight still works as normal too, if I press that button.

Re: Casio-F-91W die-shot

#142

Post by Brian_K_White »

post-it wrote: post #99
gleenn wrote: post #95

Earlier quoted context omitted.

You might be surprised to learn a lot of servers even have largish time drift. I might be repeating info which is getting out of date but I heard 30 second drift isn't uncommon. Obviously doing NTP syncing more frequently would probably help that.

Yeah, the React Native debugger is broken on my Pixel because the time is different from my laptop by ~0.5 s, so short taps register as long presses or something like that.

If it's comparing times from two different devices, then it's not broken because of the difference in times.

Re: Casio-F-91W die-shot

#143

Post by Brian_K_White »

myself248 wrote: post #61
3pac wrote: post #30

Earlier quoted context omitted.

Indiglo has good looks and function. What I dislike is that it requires a high-voltage driver. As tiny and low-current as that may be, it is electrically and even slightly acoustically noisy, and not something that belongs in a low-voltage wristwatch.

Why not? An incandescent backlight _physically gets hot_, I'd argue that has even less place in this application. It's just what they had at the time. But in either case, it's perfectly safe. There's no way to touch either the hot parts or the high-voltage parts. And even if there was, the battery doesn't have enough oomph to do anything more than tingle once the prickly part was trying to drive something as massive…

They aren't talking a out safety, they're talking about efficiency and accuracy. A boost converter is inefficient and you don't have power to waste like that in a watch. And electrical noise perturbs the timekeeping parts.

However your comparison to incandescent and your point about the momentary nature are both valid I'd say. If they had magic, they'd have used it. So they took something fundamentally inefficient and added engineering to make the best of it. A bad thing, done as well as possible,

You could say almost the same things about incandescent. It's not electrically noisy, but temperature sure does perturb the timekeeping, and incandescent definitely wastes power. Especially if you need the filament to last indefinitely instead of replacing it easily.

Re: Casio-F-91W die-shot

#144

Post by krzrak »

kens wrote: post #39
aliljet wrote: post #28

This is a remarkably interesting image. How do these guys even get these shots? I'd love to do this on all kinds of things at home..

For die photos, you want a metallurgical microscope, one that shines light down through the lens. A typical microscope shines the light from underneath, which works well for biological samples, but not so well for chips. The tricky part is decapping the chip. The easy way is to get a ceramic package, which you can decap with a chisel. Or a metal can, which you can open with a hacksaw. With a standard epoxy package, y…

Thank you for your informative answer.

Re: Casio-F-91W die-shot

#145

Post by einpoklum »

tejohnso wrote: post #98
einpoklum wrote: post #45

F-91W is the watch I wear today. Actually, my favorite wristwatch - or rather the one I wore for 25 years or so - was a W-71. Unfortunately, you can't buy these except as vintage second-hand. I still don't understand why that is... I always felt it a more "aesthetically-balanced" version of the F-91W; plus it had 4 buttons rather than 3, which makes sense given the structure both watches. But I lost my W-71 while mov…

I don't wear watches as I'm always either at my computer or have my phone with me, but if I did wear a watch, I would probably go with something like the F-91W. Images of it bring on a nice retro nostalgia, and I appreciate its blatant function over flair aesthetic.

Umm, perhaps you haven't seen the W-71:

https://duckduckgo.com/?q=casio+W-71&t=ffab&iax=images&ia=im...

not exactly flair aesthetic.

Re: Casio-F-91W die-shot

#146

Post by bowsamic »

TheRealPomax wrote: post #64
ajsnigrutin wrote: post #63

Earlier quoted context omitted.

But why? Do we really want and need a Casio rice cooker? And since they're specialists in cheap and reliable watches (and calculators and few more things), what would happen to their brand if the rice cookers were shitty?

This is a somewhat weird: do you judge Sony headphones by how good Sony cameras are, too? Or Samsung phones on how good their TVs are? Because how good a Casio calculator or rice cooker is, is entirely independent of how good their watches are? This seems to be backwards: you judge a brand based on how all its products perform, and if the balance tips towards "most are shit" then it's a shit brand. A brand making lot…

I personally would, yes

Re: Casio-F-91W die-shot

#147

Post by herbst »

TheRealPomax wrote: post #64
ajsnigrutin wrote: post #63

Earlier quoted context omitted.

But why? Do we really want and need a Casio rice cooker? And since they're specialists in cheap and reliable watches (and calculators and few more things), what would happen to their brand if the rice cookers were shitty?

This is a somewhat weird: do you judge Sony headphones by how good Sony cameras are, too? Or Samsung phones on how good their TVs are? Because how good a Casio calculator or rice cooker is, is entirely independent of how good their watches are? This seems to be backwards: you judge a brand based on how all its products perform, and if the balance tips towards "most are shit" then it's a shit brand. A brand making lot…

Samsung is the perfect example actually. Their TVs ship with a weird Android that breaks half of the Vanilla Android features. So do their Phones and Watches.

Recently I got a new dishwasher and wasn't surprised to read that the controls of Samsung dishwashers can be somewhat weird and quality is questionable as well.

Re: Casio-F-91W die-shot

#148

Post by mickael-kerjean »

jimmyjazz14 wrote: post #48
mmaunder wrote: post #24

I'm a big fan of the F105W which is basically the same watch with a vastly improved backlight that lights up the whole LCD. It makes a great watch extremely usable at night. I'd also recommend the Casio G-Shock GWM5610 which admittedly is about 5 times more expensive at $111 but it has UTC time and is absolutely bulletproof, along with radio sync and solar with solar charge indicator. It's currently my favorite among…

I don't really understand your comment about avoiding Seiko (and yes as a Seiko collector I'm a bit triggered). In my experience Seiko makes absolutely great quality watches still with maybe the only issues generally being the occasional misaligned chapter ring though I pretty much only collect Seiko mechanical watches so maybe the situation is different with their quartz watches. Citizen also makes some particularly…

I'm in the same boat, won't ever touch a seiko and refuse to do so for for 2 main reasons:

1. They have the gut of naming their watch "save the ocean" and doing things with PADI when the country they operate in is involved in commercial whaling, still go on fishing species of tuna that are on the verge of extinction or throw sharks back in water still alive after removing their fins just to make some soup. That's appalling, if North Korea would make a watch called "human right" we'd all laught and move on but, I'm not to support a company that make "dive watch" pretending to care about the ocean and not saying/doing anything toward what's actually happening in the country they operate in.

2. I'm a yema fan boy and seiko used to own yema in the 90s. Under their stewardship, they introduced plastic to hold the movement in place instead of the previous metal piece and did change the case onto a cheap low cost copy of what was available before and removed the original hands by some mercedes hands, copying everything Rolex was doing in a cheap package. That period in Yema's history was terrible, hopefully they ended up selling the brand after a few years but boy how did they make a mess

Re: Casio-F-91W die-shot

#150

Post by jimmyjazz14 »

mickael-kerjean wrote: post #148
jimmyjazz14 wrote: post #48

Earlier quoted context omitted.

I don't really understand your comment about avoiding Seiko (and yes as a Seiko collector I'm a bit triggered). In my experience Seiko makes absolutely great quality watches still with maybe the only issues generally being the occasional misaligned chapter ring though I pretty much only collect Seiko mechanical watches so maybe the situation is different with their quartz watches. Citizen also makes some particularly…

I'm in the same boat, won't ever touch a seiko and refuse to do so for for 2 main reasons: 1. They have the gut of naming their watch "save the ocean" and doing things with PADI when the country they operate in is involved in commercial whaling, still go on fishing species of tuna that are on the verge of extinction or throw sharks back in water still alive after removing their fins just to make some soup. That's app…

Well I don't know that Seiko has been directly involved in whaling in any way and some of the proceeds from the "save the ocean" line are given to divers that work to remove marine debris so that seems like a really odd connection to make.
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