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This makes me realise that I have some 250A rated mosfets lying around in a box somewhere...... Should be great to make a switch.
By the way, you can lower internal resistance and rise current drain simply by placing 2 or more mosfets in parallel to each others... just "stac them and connect all the pins with the right ones for the other mosfets (Gate with gate, etc.)
You can still add a heatsink to this assembly, as long as you have sufficient space avalable. They sell some in electronic surplus stores for about 1$. Just add some heat compound and make sure nothing get's shorted. Usually we use the rear tab (connected to emitor) to screw a heatsink on.
Alsom make sure you but the right type of mosfet for your schematic. There is 2 types avalable, N type and P type. In this tutorial, they use N type mosfets. Basically, you will just need to revert all current flow in the circuit to use p type ones (Including gate and return flow. The gate is "switching" when grounded instead of "turned on"). I don't recommend the use of P type since they are less efficient compared to the equivalent N type. Just make sure you buy the right one.
I will make a few of these to sell here on ASC. Maybe 4-5 units.
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