Recent content by stevee2002

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    Help Needed: Building 18V Power Supply for Power Tools

    Updated drawing, correcting some confusing elements, and accounting for my new 15V transformer. Hope this helps others out there trying to do the same thing as me.. BTW, my total cost, including some 'luxury' additions was less than $200, cheaper than buying 2 new batteries, and MUCH...
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    Help Needed: Building 18V Power Supply for Power Tools

    Suicide is just a slang term that refers to a standard factory-made cable which 'sacrifices itself' to simplify wiring. (Picture attached of the cables i used on my project) i don't connect 120V to 20V (forgot to modify my drawing for my new 15V transformer, so it's technically 15V AC now...
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    Help Needed: Building 18V Power Supply for Power Tools

    Sorry, new to attachments.. Here it is.
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    Help Needed: Building 18V Power Supply for Power Tools

    Thanks, other Steve, for the help.. Wish i would've chatted with you before ever buying my first transformer (it was 20V, not 18; i even thought i was doing good by accounting for diode voltage drop). Would've been nice to save 60bucks and hours of head-scratching.. Had to figure out about...
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    Help Needed: Building 18V Power Supply for Power Tools

    Kevin, I solved it by buying a 15v toroidal transformer (originally bought 18v).. I was looking at using a series of bridge rectifiers on each leg to drop the voltage gradually, but the right size ones and the amount i needed was like 40-50 bucks. Turns out a dual 10-amp 15v xformer was only 40...
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    Help Needed: Building 18V Power Supply for Power Tools

    Laurence, I finally got mine working; rather than try going down the switching power supply road, I just bought a new 15V AC toroidal transformer. After bridge rectification (i use a separate bridge for each of the two transformer coils), and capacitor smoothing, I get about 21V smoothed DC...
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    Help for School Project

    I have never dealt with robotics projects, but you could look into using Lego's for the track and gate contruction, as these are widely available and cheap. The patterned bumps can also serve as a guide for the wheels. For the robot itself, you can also look into Lego K'nex, or Lego Mindstorm...
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    Help Needed: Building 18V Power Supply for Power Tools

    It is a manufactured toroidal transformer, purchased it for about $60 from Antek, so i'm not quite comfortable with taking it apart, let alone know what i'm doing.. I don't know anything about switching regulators, where would i get one for this kind of application? Would it be better to install...
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    Help Needed: Building 18V Power Supply for Power Tools

    Thanks for the help. I used the amp function on my multimeter to see what kind of draw a standard cordless drill pulled on the original battery (Ryobi 18V ONE+ and Lithium battery); just on motor ramp up, with no load, it blew the 10 amp fuse in my multimeter. I found a 120V drill with 2Amp...
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    Help Needed: Building 18V Power Supply for Power Tools

    Hey guys, I'm very new to understanding electronics, and I don't speak equation, but I'm hoping I can get some help with my project. I’m building a power supply to replace the 18Volt batteries on my Ryobi Power Tools; I’ve successfully completed it, but have ended up creating a 29V power...
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