Spectric
04-16-04, 06:16 AM
Hi all
I am looking at powering a PC system from a 12 volt vehicle supply. The system is a bare bones system which has an AMD 1.2 Ghz CPU and 512 Meg memory. The purpose is to run a GPS based navigation system on a 10 inch flat pannel display.
Looking at what voltages are needed, 12, 5 & 3.3 positive and 12 & 5 negative it seemed very inefficient to use a Dc to Ac invertor to produce a 240 volt mains supply to feed the std ATX psu which then produced all lower voltages.
So can anyone see any reason why you cannot build a psu that is based upon linear regulators like the 317 and 7805.
I believe that the 3.3 volt rail is delayed until after the 5 & 12 volt rails are ok but any other issues I have overlooked.
Else can anyone offer a better solution ?
I am looking at powering a PC system from a 12 volt vehicle supply. The system is a bare bones system which has an AMD 1.2 Ghz CPU and 512 Meg memory. The purpose is to run a GPS based navigation system on a 10 inch flat pannel display.
Looking at what voltages are needed, 12, 5 & 3.3 positive and 12 & 5 negative it seemed very inefficient to use a Dc to Ac invertor to produce a 240 volt mains supply to feed the std ATX psu which then produced all lower voltages.
So can anyone see any reason why you cannot build a psu that is based upon linear regulators like the 317 and 7805.
I believe that the 3.3 volt rail is delayed until after the 5 & 12 volt rails are ok but any other issues I have overlooked.
Else can anyone offer a better solution ?