New Microsoft Tech Makes Battery Changes a Breeze
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From: terryc on 5 Jul 2010 09:29 On Mon, 05 Jul 2010 09:32:10 +0200, Meindert Sprang wrote: > Well, if I have to replace the four batteries in my digital camera in a > dim environment, I really need my reading glasses to see where the + and > - markings are. Being able to just "throw" the batteries in the hole > would be a great thing. Could you work it out from the flats/bumps on the flap?
From: terryc on 5 Jul 2010 09:31 On Mon, 05 Jul 2010 10:09:06 +0100, tim.... wrote: > If you are "replacing" batteries isn't it just simpler to remember how > the ones you have just taken out were positioned? For my canon EOS, four batteries in pairs and the second one falls over when you take the first out. Then it is a case of reading the +/- signs.
From: Joe Pfeiffer on 5 Jul 2010 11:55 "tim...." <tims_new_home(a)yahoo.co.uk> writes: > "Meindert Sprang" <ms(a)NOJUNKcustomORSPAMware.nl> wrote in message > news:4c318b3e$0$22937$e4fe514c(a)news.xs4all.nl... >> "bigbrownbeastie" <bigbrownbeastiebigbrownface(a)googlemail.com> wrote in >> message >> news:8e23fff9-b39f-4ed4-bd01-5765a0f4db8d(a)j4g2000yqh.googlegroups.com... >>> isn't this a solution to a non-problem. How many people see the >>> embossed image and still get it wrong? >> >> Well, if I have to replace the four batteries in my digital camera in a >> dim >> environment, I really need my reading glasses to see where the + and - >> markings are. Being able to just "throw" the batteries in the hole would >> be >> a great thing. > > If you are "replacing" batteries isn't it just simpler to remember how the > ones you have just taken out were positioned? One would think. But in my experience... no. -- As we enjoy great advantages from the inventions of others, we should be glad of an opportunity to serve others by any invention of ours; and this we should do freely and generously. (Benjamin Franklin)
From: Clifford Heath on 5 Jul 2010 22:48 Joe Pfeiffer wrote: > "tim...." <tims_new_home(a)yahoo.co.uk> writes: >> If you are "replacing" batteries isn't it just simpler to remember how the >> ones you have just taken out were positioned? > One would think. But in my experience... no. Right. And when you're bouncing along a bush track in the back of a 4x4, trying to navigate on paper maps using the light of a head-torch during a hidden-transmitter hunt, and you need to change 3 AAA batteries in the round cartridge, you have to get all three right and do it *now*... while juggling the torch, the maps, the cartridge, the old batteries, the new batteries... well, you can see why it's easier just to take a spare head-torch ;-) But this tech would often be a help, and personally I'd pay a little extra for it!
From: Andrew Smallshaw on 6 Jul 2010 04:44
On 2010-07-06, Meindert Sprang <ms(a)NOJUNKcustomORSPAMware.nl> wrote: > "Joe Pfeiffer" <pfeiffer(a)cs.nmsu.edu> wrote in message > news:1bfwzxdwg7.fsf(a)snowball.wb.pfeifferfamily.net... >> "Rod Speed" <rod.speed.aaa(a)gmail.com> writes: >> >> > Doug Jewell wrote >> >> Rod Speed wrote >> > >> >>> Doesnt have to be anything like that much of a drop. >> > >> >> You're aware of power diodes that have much less than .6V voltage drop > eh Rod? >> > >> > Didnt say anything about power diodes. >> >> Then what are you talking about? > > MOSFETS I was thinking along similar lines albeit BJTs rather than MOSFETs - it is not for nothing than MOSFETs are often drawn with a parasitic reverse biased diode. I've actually done this kind of thing using BJTs in the past although the intent there was to reduce heat dissipation rather than voltage drop although that pretty much means the same thing at the end of the day. The drop is reduced to two collector-emitter losses. You do need to watch the voltage though since my experience is that BJTs can breakdown far faster than you might expect when reverse biased. However that is unlikely to be a problem for battery powered equipment particularly when you are having one circuit per cell as here. Actually, thinking about that I'll have to go through it and see if the system I used would actually work in that arrangement. It's just possible the other cells could interfere with the biasing and I don't have a schematic in front of me to consider that possibility. -- Andrew Smallshaw andrews(a)sdf.lonestar.org |