nightmaim Posted April 13, 2010 Report Share Posted April 13, 2010 Hello! I'm about to buy a DC720, my first DeWalt tool. I'm planning to use a power supply to drive the tool, which I've been using to power another 18V chinese drill. I don't have any DeWalt battery to check the terminal of battery, so I need to know what is negative and what is positive to connect. I did a research and it seems that this is the right polarity: Can anybody confirm that? Thanks! Link to comment Share on other sites More sharing options...
kanxrus Posted April 13, 2010 Report Share Posted April 13, 2010 Correct. Any reason why you wouldn't just buy a corded drill? Link to comment Share on other sites More sharing options...
nightmaim Posted April 13, 2010 Author Report Share Posted April 13, 2010 Thank you, JC. Any reason why you wouldn't just buy a corded drill? It's a long history, I never found a corded drill with 2-speed transmission, they are too fast with low torque, even in lower speed it's hard to control and usually damage the screws. Another reason is the keyless chuck plus the clutch which is hard to find in a corded drill. Some time ago I made a power supply with an internal 18V Ni-CD battery, so I can use when mains is not avaliable, or if I use plugged into AC it charges the battery when the trigger is not pressed and helps the motor when is pressed. Once I used all day with my old cordless drill and the battery still charged. Link to comment Share on other sites More sharing options...
kanxrus Posted April 13, 2010 Report Share Posted April 13, 2010 I'd like to see a photo of this alteration. Link to comment Share on other sites More sharing options...
nightmaim Posted April 13, 2010 Author Report Share Posted April 13, 2010 Ok, give me 1-2 days to draw the circuit schematics and take photos. Link to comment Share on other sites More sharing options...
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