I have a project that I've been working on for quite a while now. I'm using a scavenged laptop motherboard in a custom computer project, and I would like to provide power from a small form atx power supply which can suppy 12v at up to 17a so around 200w total power available. but it's not enough to power the laptop board. Any commercially available power booster that I've found can't provide the 3.5a required by the motherboard. I've found some variable voltage ones that are overkill, imo, for this. Can anyone help me design a small relatively inexpensive booster that can take the 12v to 19v? I have soldering, wiring, and moderate electronics skill, but I just don't have the maths or design skill to design it. Thanks in advance.