Home Repair (alt.home.repair) For all homeowners and DIYers with many experienced tradesmen. Solve your toughest home fix-it problems.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #41   Report Post  
Posted to alt.home.repair
external usenet poster
 
Posts: 805
Default 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.

  #42   Report Post  
Posted to alt.home.repair
external usenet poster
 
Posts: 3,761
Default 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
  #43   Report Post  
Posted to alt.home.repair
external usenet poster
 
Posts: 11,538
Default 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.


  #44   Report Post  
Posted to alt.home.repair
external usenet poster
 
Posts: 1,143
Default 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
Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Gas powered battery charger. RogerN Metalworking 48 March 14th 09 07:33 AM
battery-powered soldering iron gearhead Electronics 5 May 20th 08 04:56 AM
Q: Make an amplifier battery powered? a.busker Electronics 9 April 21st 08 05:52 PM
battery powered drills; auto 12v yet? werwer Home Repair 18 October 11th 07 05:17 AM
Battery powered vacuum cleaners Paul Mc Cann UK diy 3 January 2nd 05 01:53 AM


All times are GMT +1. The time now is 10:54 AM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"