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Power supply

post #1 of 11
Thread Starter 
This has nothing to do with cans, or amps, first off. But I thought that since many of you have had to build power supplies, you might be able to lend a hand........

What I need is a power supply outputting from 21-21.3VDC @ 2.4A, from 120VAC. I don't need clean power, as you would in almost anything else. This PS will simply be used to drive my cordless drill........lol

The catch is this: it has to be fairly small. I have to be able to fit it into a Dewalt 18V battery pack, if any of you are familiar with those. So the transformer is going to have to be as small as I can get away with. This is basically going to be a 120VAC PS for my cordless tools. Dewalt makes one of these for their 24V tools, but not their 18..........

Anything you guys can come up with would be greatly appreciated.........
post #2 of 11
Maybe you should be looking at a switching power supply for that high a voltage-amp requirement at a small size. In the case of a switching power supply, you won't have the huge and heavy transformer you have with a linear supply.
post #3 of 11
Thread Starter 
Hmmmmmm, I've got quite a few ATX power supplies I could tear into here, for parts. Anyone know what the main transformer in one of those outputs?
post #4 of 11
Okay, maybe I am missing something, but why would you want to plug in your cordless drill?? Why not just get a 110vac drill?
post #5 of 11
Budgie, have you seen the prices on power tools at your local hardware store?
post #6 of 11
Thread Starter 
Because I've got $600 worth of Dewalt cordless tools, and batteries for these are about $90 each.........No need to go out and buy another set of tools......
post #7 of 11
You can pickup a 110vac drill for very little money at most hardware stores. If you are willing to go for a houshold duty rated one they are under 50 bucks (3/8 chuck). Also, check around for a Dewalt repair center in your area and check for prices on the batteries there. Might save you a few bucks.
Just for fun: My drills-

Milwaukee brand
3/8 18 volt
1/2 18 volt D handle
1/2 110 vac Magnum
1/2 110vac hammer drill
3/4 110vac hammer drill (holes up to 1 1/2 inch in concrete

1/2 110vac Makita heavy duty (looks like a Milwaukee Hole Hawg)

3/8 12volt Ryobi (retired from commercial work, lives on my work bench now)

3/8 110vac Rockwell (used mainly at home- nice drill)

I think that is all of the drills. Then there are the saws, grinders, sanders, routers, etc.

(of course I realize this doesn't help with your question.....)
post #8 of 11
Thread Starter 
Yes, I realize I could go out, waste money, and purchase a new set of corded tools. However, I don't subscribe to that particular ideal. If I can't buy it, I'll make it. I thought that was a big philosophy in DIY. You know, Do It Yourself............What manner of things wouldn't we have now if someone hadn't said "Well gee, no one sells this particular widget, guess I'll just have to make one!"

Nothing personal, but I just have no interest in buying a corded tool(s). I have the tools. I'm simply looking for an alternative power source...............Anyone?
post #9 of 11
Why do you want the whole power supply to fit in the battery pack? Why not make an external box that sits somewhere near the plug, then use an empty casing for the battery compartment that only has the power supply wires coming from the external box? That would probably be much easier and keep the drill lighter.
post #10 of 11
Thread Starter 
I had considered that, but dismissed it as a last-resort idea. Dewalt makes an AC-DC adapter for their 24v line of tools, plugs into the tool just like a regular battery pack, so I wanted to see if I could duplicate this for my 18V tools.......
post #11 of 11
I am not trying to talk you out of it. Just offer an option. Bye.
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