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18V battery powered tools. Or 120 volt packs?
On Fri, 3 Jul 2009 10:35:57 -0400, "Ed" wrote:
wrote in message .. . On Thu, 2 Jul 2009 20:55:58 -0400, "Stormin Mormon" wrote: Nicad and nickel metal are 1.2 volts per cell. For those, you'd need 100 to make 120 volts. Well, goody, goody for you. There are also cells that are 2.2 volts per cell. I didn't specify any particular technology. Just that no existing technology would allow for a "very, very, small" 120 volt battery to power a drill. If you choose cells that produce 1.2 volts each, then you will also end up with something bigger than "very, very, small". IIRC, back when the first RCA portable radios hit the market in the 1950's, they had a 90V battery in them. I'm sure it is possible to make a 120V battery, but may not be practical. I have a Motorola portable radio here with just such a battery (long dead of course) Like modern batteries, it is actually a lot of small cells connected together to get the higher voltage. Its physuically about the4 size of 8 C cells, but of course it has many more cells than that. The radio has a second battery to power everything else. The 90 Volt is just to heat the tubes. |
18V battery powered tools. Or 120 volt packs?
Ed wrote:
wrote in message ... On Thu, 2 Jul 2009 20:55:58 -0400, "Stormin Mormon" wrote: Nicad and nickel metal are 1.2 volts per cell. For those, you'd need 100 to make 120 volts. Well, goody, goody for you. There are also cells that are 2.2 volts per cell. I didn't specify any particular technology. Just that no existing technology would allow for a "very, very, small" 120 volt battery to power a drill. If you choose cells that produce 1.2 volts each, then you will also end up with something bigger than "very, very, small". IIRC, back when the first RCA portable radios hit the market in the 1950's, they had a 90V battery in them. I'm sure it is possible to make a 120V battery, but may not be practical. Tube type radios had "A" and "B" batteries. The "A" battery was for the tube filaments and the "B" was for the plates. You can still find B batteries but they're rare. There was also a "C" battery in some of the radios. http://en.wikipedia.org/wiki/B_battery_(vacuum_tubes) Years ago I owned a Graflex Strobe 4 flash unit and it required a pair of 225 volt batteries. I could melt people's eyes with that darn thing. TDD |
18V battery powered tools. Or 120 volt packs?
Ed wrote:
wrote in message ... On Thu, 2 Jul 2009 20:55:58 -0400, "Stormin Mormon" wrote: Nicad and nickel metal are 1.2 volts per cell. For those, you'd need 100 to make 120 volts. Well, goody, goody for you. There are also cells that are 2.2 volts per cell. I didn't specify any particular technology. Just that no existing technology would allow for a "very, very, small" 120 volt battery to power a drill. If you choose cells that produce 1.2 volts each, then you will also end up with something bigger than "very, very, small". IIRC, back when the first RCA portable radios hit the market in the 1950's, they had a 90V battery in them. I'm sure it is possible to make a 120V battery, but may not be practical. Even before then. Tube-type radios (i.e., think WW2 portables) needed plate voltage, typically 90v, from a type "B" battery. Some sets needed as much as 300v and used several "B" batteries in series. |
18V battery powered tools. Or 120 volt packs?
HeyBub wrote:
IIRC, back when the first RCA portable radios hit the market in the 1950's, they had a 90V battery in them. I'm sure it is possible to make a 120V battery, but may not be practical. Even before then. Tube-type radios (i.e., think WW2 portables) needed plate voltage, typically 90v, from a type "B" battery. Some sets needed as much as 300v and used several "B" batteries in series. I think our "utility" (WW2 economy standard) radio in UK used a humongous 120V battery for the "anodes" (AmE="plates"), but it's possible that it had some lower-voltage taps as well. I think we used a 2V lead-acid cell for the filament voltage. I recall that some of those humongous batteries I saw (but not ours) had -ve connections as well, for the radios that needed a separate bias supply. We used ours for years after the war had ended, because we lived out in the country and had no connection to the public electricity supply. In fact we lived so close to a BBC monitoring station that we were not allowed to have overhead power lines, and to lay cable underground was horrendously expensive. For a while we had a 32V DC generator with a bank of humongous wet cells, then we graduated to a diesel-powered 2KVA (!) alternator system. I was well into my teens before we had a connection to the public supply. Perce |
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