Joe
Administrator
Supporting Hayley since 2003!
Posts: 6,715 
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Post by Joe on Dec 31, 2013 1:41:12 GMT
SCART plugs
They are just so ugly
Bah Humbug ! Hiya Paul, I don't know the name of them over here (cable connector maybe), but my first computer printer had 20+ pins  |
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Post by Richard on Dec 31, 2013 8:23:09 GMT
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Post by comet on Sept 2, 2015 10:57:05 GMT
In praise of something that works and solves a lot of problems.
I detest disposable batteries with a vengeance.
Duracell Recharge Ultra AA Batteries do what they say on the pack. They stay charged for weeks even outside in the cold.
The beauty of these rechargeable batteries is the voltage stays higher than most other rechargeable batteries at around 1.35 volts instead of the 1.2 volts of most of the other brands. (Even though Duracell print 1.2v on the pack) 2400 milliamps or 2.4 amps for an hour at 1.35 volts is pretty incredible for a standard off the shelf in any supermarket type battery. (The first rechargeable batteries I ever had were only 90 mah, pretty useless really)
Lots of gadgets that use only two batteries (audio recorders and cameras) will only run for a short period on the other brands but the voltage drop causes the device to switch off.
So for all you guys who use gadgets I hope this information will help solve some of those problems.
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Post by Richard on Sept 3, 2015 8:19:29 GMT
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Post by martindn on Sept 4, 2015 12:22:14 GMT
Depends on how often you have to replace/recharge. Those batteries sound ideal for powering the outdoor components of my weather station. Bit I am not sure that they would let me down less frequently than the disposable type, which last well over a year in all weathers. Actually I have always changed them after a year or so as a precaution, rather than allow them to let me down.
Martin
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Post by comet on Sept 4, 2015 15:52:18 GMT
Depends on how often you have to replace/recharge. Those batteries sound ideal for powering the outdoor components of my weather station. Bit I am not sure that they would let me down less frequently than the disposable type, which last well over a year in all weathers. Actually I have always changed them after a year or so as a precaution, rather than allow them to let me down. Martin I'm curious Martin, why is your weather station so critical ? I have some of the AAA ones in a temperature sensor outside, I think it may be more than two years since I charged them. Interestingly Richard, the Duracell site does not even mention the voltage, as if somehow it doesn't matter. A standard AA disposable battery has a voltage of about 1.5 volts or more when new. So most 2 battery circuits were designed with three volts in mind, so the drop to 2.4 volts can be critical. The 2.7 volts of the pair of Duracell batteries can make all the difference in whether the circuit will operate or not. We have two cameras in the house, a Nikon and a Sony that will happily run on the two Duracells but fail quite quickly on any 1.2 volt rechargables . |
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Post by martindn on Sept 4, 2015 20:56:56 GMT
When you have kept weather records for many years, you want them to be continuous. If you lose readings, then that is not so. I have backups for sure, manual thermometers and a rain gauge, but when I am away from home and can't take regular readings, I rely o the automatic systems to do their stuff. Also, some years ago, I moved from 9am daily readings to days ending at midnight, despite the fact I am more likely to be in bed at 9am than midnight. I always read the manual instruments when I get up in the morning. The automatic ones just do their stuff. So you see I don't want to risk the batteries running out on my automatic weather station, and so far they never have. I', not sure that the tiny savings in cost from using rechargables would be worth it. Especially as I would have to keep a spare set permanently recharged to avoid a total loss of reading whilst I recharged the batteries. homepage.ntlworld.com/m.dixon4/Cumulus/index.htmMartin D |
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Dave
Administrator
HWI Admin
Posts: 7,699
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Post by Dave on Sept 4, 2015 22:12:36 GMT
I use one of these babies:  which would keep my Davis VP2 powered in the dark for 8 months but they last well over 2 years as there's a solar panel (and large capacitor for overnight storage) so battery drain only occurs in the depths of Winter. I find that it's a well balanced combination. Indoors my Davis console and my Weather Envoy (for PC connection and grass temperature sensor wire) are powered from mains, with battery backup which is rarely used at all. I have a solar powered fan to push air through the radiation screen whenever the sun is out (or the day is bright) and this just turns off at night or in dull weather so needs no batteries at all. In other words, battery changing for me is luckily a rare event! www.wunderground.com/personal-weather-station/dashboard?ID=IENGLAND600#historyCheers, Dave |
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