Hybrid cordless (but wired) battery-powered tools?

There are a few items like that sold for rescue work. Saws and such where the small battery packs don't last long enough to finish rapidly. Also a few others.

I've considered opening the battery-box of a cordless tool and replacing the dead battery pack with a suitably-sized transfomer and small rectifier circuit. That way, if the charge on the working tool gives out, AND I have access to 120v, I can keep going with only a small inconvience.

Den 22-01-2013 01:49, John Doe skrev:

Dremel is owned by: Bosch ;-) Look at the copyright line at the very bottom of this page:

Replace it with a male plug..and put your transformer and rectifier in a box with a power cord and plug for the wall.

Its much easier to find a place to heat sink and mount in a small box..then it is to find a place in the drill.

Seriously

Gunner

The methodology of the left has always been:

1. Lie
2. Repeat the lie as many times as possible
3. Have as many people repeat the lie as often as possible
4. Eventually, the uninformed believe the lie
5. The lie will then be made into some form oflaw
6. Then everyone must conform to the lie

Good idea. Thanks.

Any pictures? Any names? Any keywords? Ever see one?

Okay...

Pack the box with supercapacitors or an LM350-based linear supply. The LM350 (beefier, 3 amp version of the LM317T regulator) voltage is easily set with 2 resistors.

On Thu, 24 Jan 2013 22:18:28 -0700, Father Haskell wrote (in article ):

Make sure the motor draw doesn't exceed 3 amps (most battery operated tools do just that at peak loads). The "T" cased regulators will require a substantial heat sink to operate continuously over 1 amp. If I remember correctly, they have a typical voltage drop of 1.2V.

I posted a picture a while back of a Dewalt drill (12volt I believe) fitted with a switching power supply built into the battery pack. A nice way to swap between cordless and corded.

Also consider the large number of cheap switching power supplies on the market. I use 12V laptop chargers (6 amp) for LED cabinet lighting. They have nice, durable cases and can be had for $10 on sale from a number of places (mcmelectronics.com for one)

You can also get a number of different voltage 'wall-wart' type switchers for real cheap. Unless you have a suitable transformer (and case) handy, going with a switcher will provide more power that a linear supply in a smaller package.

-Bruce

As for Computer Power Supplies...one may find them free or nearly so by simply looking in the phone book for "computer recycliers"

Several that I visit regularly will have several cubic Yards of them on hand, ready to be run through the shredders and I can take a clothes basket full of them for little or nothing

Gunner

The methodology of the left has always been:

1. Lie
2. Repeat the lie as many times as possible
3. Have as many people repeat the lie as often as possible
4. Eventually, the uninformed believe the lie
5. The lie will then be made into some form oflaw
6. Then everyone must conform to the lie

Drawing more than 3 amps will just shut down the regulator until load is removed. Adding a pass transistor (or several) should remedy the problem.

What does a cheap auto battery charger go for? Handy for other things besides powering a drill, such as derusting old iron.

On Mon, 28 Jan 2013 00:40:16 -0700, Father Haskell wrote (in article ):

Not exactly what I'd call portable, but you can get battery chargers (new) for about $10 They usually have a funky voltage regulation curve so speed control may act weird but it would be worth trying.

-Bruce