hello,
i own a toshiba qosmio x500, and as many owners of this laptop, or computer guru's will know, is this is the most stupidly designed gaming computer ever built by toshiba. the laptop has a 2mm clearance from the surface it rests upon, and the air intakes are all located beneath the laptop, meaning that anything which uses more than 20% cpu and ram, will overheat the laptop causing a restart (in which case the thermal overload trips again and again until you get a blue screen of death), or a blue screen of death.
Anyway, i have decided to build a cooled stand, very simple design, its some folded aluminium sheet metal, about 3mm thick, and i plan on cutting holes for the air intakes.
now, another downside to the design of this computer is that even if it has air access, at over 70% capacity of cpu and ram (or 100% cpu and over 20% ram and vice versa), it cant get enough air in, also, 3 of the 4 air intakes dont really suck in any air at all. for normal gaming over a few hours, it needs a cooling pad with extra air flow.
now, i need a 12v supply, to power my PC fans. i plan on getting a battery pack, likely a flat SLA, and need a 12v charger from the USB port of my laptop, the SLA in turn will power my fans, and also a peltier cooler, but thats only when its plugged in.
I need a circuit which can provide sufficient current to power the fans without the battery, around 800-1000mA will suffice ill take whatever the usb ports can give, i have a usb 3.0 port to use as well, im not sure how much power it deliveres, but im sure it is more than a normal USB port.
i just need a circuit for converting 5v to 12v whithin the limits the usb port(s) can withstand.
also, if anyone has some pointers, i would very much like them on how to add an SLA to this , but if its simpler to use a pack of rechargable AA's , ill use them instead.
any help is greatly appreciated.