My sis gave me a cheap B&D cordless driver a few years ago. It never would hold a charge for long even on the shelf but I used it anyway for a couple of years. I like the size and weight of it and having pretty bad arthritis in my hands it was sorely needed.
First the spring for the ac prong release button broke and started poking out, which I removed before it had the chance to short the ac main. Then the batteries died and wouldn't charge.
I removed the batteries and charger board and soldered two wires directly to the direction/power switch and the motor works fine although a bit fast from two 1.5 flashlight cells as the motor is rated for 2.4v. I want to convert it to a corded driver. I don't need cordless while working on my bench and don't want to have to wait for batteries to charge in order to use it either.
I tried a few different PSUs, wall-warts, etc. but nothing would supply enough stall current to get it turning. I did some current readings, it pulls over 3 amps at stall and 1.5 amps free running. I use an old Delta 145w ATX PSU on my bench for powering drives etc. and decided to try the 3.3v output to run the screwdriver, which worked.
I don't want to burn the motor out with over voltage so I connected a 3 amp silicon diode in series and it dropped the voltage near perfect to 2.45v. This is fine for the time being but I'd like to build a PSU into the handle of the driver and just run an ac cord to the outlet but haven't had luck finding an appropriate circuit.
First the spring for the ac prong release button broke and started poking out, which I removed before it had the chance to short the ac main. Then the batteries died and wouldn't charge.
I removed the batteries and charger board and soldered two wires directly to the direction/power switch and the motor works fine although a bit fast from two 1.5 flashlight cells as the motor is rated for 2.4v. I want to convert it to a corded driver. I don't need cordless while working on my bench and don't want to have to wait for batteries to charge in order to use it either.
I tried a few different PSUs, wall-warts, etc. but nothing would supply enough stall current to get it turning. I did some current readings, it pulls over 3 amps at stall and 1.5 amps free running. I use an old Delta 145w ATX PSU on my bench for powering drives etc. and decided to try the 3.3v output to run the screwdriver, which worked.
I don't want to burn the motor out with over voltage so I connected a 3 amp silicon diode in series and it dropped the voltage near perfect to 2.45v. This is fine for the time being but I'd like to build a PSU into the handle of the driver and just run an ac cord to the outlet but haven't had luck finding an appropriate circuit.
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