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As I stated in the post right before yours, I have chosen to go with building a 12 DC to 5v, 3.3v, 12v, etc. regulated ATX power supply. I simply need to know the specific power requierments of the motherboard. With my current designs I have gotten the weight without battery to 3 to 5 lbs...

I have done much of what you suggested already in fact I have come to the conclusion that a DC to DC power supply is what I am really after. Here is a link to that page in the computer engineering section as it has my current calculations and full design plans (I am not sure if the link will...

Sorry for the totaly "lamens" question I am marine biologyst electical engeneering is only a hobby. I have done more work and some of the basic calculations myself but I still need help with the DC power supply I am working on. You can find more specifics on the project in the...

I have come across actual plans for a 8-17V DC power supply (PCB board diagrams I can use to etch and build from scratch) It measures 142mm x 46mm (height would be determined by the size of heat sink I choose) and weighs under half a KG (also dependent on heatsink) It is extreamly efficient...

One thing that I don't understand is how much of a draw (in amps) the system is actually going to place on the battery. I am confused as to when they say "minimum 90 watt power supply required" is that 90 watts at 120 volts AC or 12 volts DC? And does that 90 watts include the entire...

I was wondering if anyone out there could show me how to solve this problem. Basically I am contimplating making a portable computer that I want to power with a battery and an AC power inverter (I couldnt find a 150W power supply that accepts 12v DC - only 120v AC so I have to use an inverter) I...

I was wondering if anyone out there could show me how to solve this problem. Basically I am contimplating making a portable computer that I want to power with a battery and an AC power inverter (I couldnt find a 150W power supply that accepts 12v DC - only 120v AC so I have to use an inverter)...