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Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
OK, so I'm not going to do this, but it is practical (for loose meanings of the word practical) (like less impractical than the guy who clipped a bunch of PP3 batteries together) and inexpensive (compared to some of the other ways of wasting money there are).
My wife's kitchen scales have started flashing 'low battery', at the same time as my car key fob is getting weak. They both take CR2032 batteries. Where to get them from? Walk into a shop in the high street? They are several GBP each at Maplin's. Rapid Online has them for 0.5 GBP, but they charge big for delivery of small orders. What about eBay? Result, 0.5GBP each including delivery for top brand Duracells in 4 to 10 quantities.
But wait, what's this while I'm browsing? 100 off CR2032s for 7.5GBP, that's 7.5p each, about 2.5p per volt, and at 3.2mm tall, about 1volt per mm. Now I've never heard of the brand, so they're probably rubbish for capacity or discharge curve, but they probably do start at 3v. Take a plastic pipe 20mm internal diameter, 1.2m long, stack it with 25GBP's worth of batteries et viola, >1000V.
Uses? Not many. Wow, look at the size of my battery. Hey, feel this! Oops, sorry, it will probably grow back! You could wield it like a light sabre (well, heavy sabre) at the cat, with a suitable current limiting resistor at the sharp end.
Now the rules of economics are such that if you look for smaller batteries, CR12xx or CR16xx to get a smaller diameter, or CRxx16 to get one that's 1.6mm thick, they are more expensive than the big CR2032, which has economies of scale, and a fraction of the capacity.
I've also bought 5 of the uber cheap ones just to see what their capacity/discharge is like. At that price, it has crossed my mind that 3 in series would be better in my many cheap DMMs than PP3s.
Registered Member #1565
Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
Seems doable. I would say go for it given you can fix the safety aspects. Just one advice: do use a spring at the end for better connection. And do remember those "High voltage" stickers.
Only 30 of them, and you can replace the high voltage transformer from a TV :D
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Could be a practical, compact bias source for ionization chambers used in the microamp range or lower. For example, in smoke detectors, or to measure fields of scattered x-rays. Thanks for the tip.
For the same potential application, I have been saving retired 9 volt batteries that still develop at least 6 V.
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1000v battery?
