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Originally Posted by squeeforever
Could somebody help me? Not sure if this thing will work, but I guess it might. Heres a picture of the PS sticker.
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Holy cow, that's a small PS!! Only 2A @ 12v is only ~24w. I don't think it'll work, unless you don't mind charging at 0.1A or 0.2A. :)
Neweuser: It's hard to tell which output has the regulation feedback circuit. Maybe just one, maybe all three. I think it might vary by manufacturer and model. So, I would just add the load to both the 5v and 3.3. There will be a little wasted power from those resistors, but not a whole lot.
As to your other question; I'm not sure I understand. As the diagram illustrates, the 5v or 3.3v wire hooks to the resistors in the manner shown. I tried to make the actual connections quite clear. Series hooks the resistors end to end with the wires on the very ends (kinda like a typical NiMH battery pack), while parallel hooks the ends together and then to the wires. The colors are exactly the colors as seen in the power supply.
This parallel/series connection is just a way to get the exact resistance value (and power value) needed using the resistors available. If you had an exact 2 ohm resistor, you only need to use one (as long as it is 20w instead), but the choices were limited, especially at RadioShack.
I laid out the resistors physically side-by-side just so the resulting resistor "pack" is neater, easier to wire up, and easier to insulate. You can then add heatshrink over the connections and even over the very end of the resistor(s) as long as the majority of the resistor is exposed to the air to aid in heat dissipation.
I hope I answered your question, but please forgive me if I don't understand.