--- Lamar Owen <[EMAIL PROTECTED]> wrote: > >Is this a typical motherboard (ATX) or is this something oddball? My notebook >requires 19.5V at the DC input -- but there are inside-the-case DC-DC >inverters that transform to the required internal voltages. > >A standard MB takes +12V, -12V, 5V, and 3.3V, plus a signal back to the power >supply called 'power good' (and then there's the turn-on lead). Standard >desktop-style hard drives, floppies, and CD's take 12V and 5V. Notebook HD's >take 5V only. Newer AGP stuff takes 1.5V. >
It is supposed to be a typical ASUS mobo but its dimensions are 100x150mm so it is smaller than any other standard mobo that I could find here. I had to buy the whole computer to get it as there is only one company that is legally allowed to sell it in Korea and they only sell it as a complete unit (minus cpu). Incidentally this is intended as a prototype which I can use to get more funding for the concept. A portable, Linux run, professional digital recording device. The target audience is film, television, and radio sound engineers. People who need better quality than a minidisc but don't want to spend excessive amounts on a notebook+usbcard+portable power supply but already have a pci soundcard that they could use to get the quality they need. >Do you have an existing AC power supply? If so, you need to actually measure >the current consumed (and the voltage at which that current draw occurs) >before you can size a battery. > Yes and that is also custom made for the board. I don't have it in front of me at the moment but I can remember that it is a 125 watt AC. It is slightly larger than a notebook adapter and is switchable 110/220 volts. Basically it is just a standard power supply just very small. It is also only available with this computer. > How do you plan to charge the battery? That is really dependant on what type of batteries I use but ideally I would like to be able to plug into the wall and the batteries are charged without having to take them out of the case. The same way as a notebook battery is charged. I can work around this if it adds too much weight to the case by providing a seperate charger but that means more accesories to lug around on the road which is a negative selling point. > >> >2.) Required current. At the required voltage, how much current does the >> > PC draw? This is necessary for the next criterion: > >> Does anyone know what this would be based on the above hardware? > >You have to measure this with a multimeter. In case you have never done >current measurements before, the basic concept is to place the ammeter in >series with the power supply. This can be difficult, depending upon the >supply. But, if you can get to one leg of the supply by itself, clamp-on DC >ammeters are available that will allow you to get an accurate reading without >messing with the wiring. > > As another aside, I carry such an outfit with me all the time >-- two Power Wheels 7AH 12V batteries plus a 120W inverter, all in a military >surplus ammo case (7.62mm NATO, the small case). I'm an amateur radio >operator (KF4MYT), and often need to run my Yaesu FT90 mobile radio outside >the car. The ammo-pack power-pack does the trick without the inverter. It >can also run my notebook with the inverter. > That's similar to how I want to package it only in plastic for weight saving. >You may find that the current draw of a typical desktop MB is very high. > What is considered high when batteries are involved? -- Patrick Shirkey - Boost Hardware Ltd For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.boosthardware.com/LAU/guide/ _____________________________________________________________ Want a new web-based email account ? ---> http://www.firstlinux.net _____________________________________________________________ Run a small business? Then you need professional email like [EMAIL PROTECTED] from Everyone.net http://www.everyone.net?tag
