Thread: Newbie in dc power supplier for car pc

im a newbie in building a car computer regulated 12 volt 10 amps psu for my carputer i know it drops as much as 8 volts and kick up as high as 14 volts how ever i cant buy the psu sold online such as the opus because im from a third world country and they dont deliver or sell it here and last reason i think its too expensive for their use is there any alternative. or anyone has a good schematic for building such a power supply.

thanks to anyone who could help