Testing MOSFET heatsinks... Does size matter?

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In this video, I am testing 1/8" heatsink material vs 1/16" heatsink material. Does size matter? Is the heat dissipation a function if surface area or thermal mass?
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You can't use an IR thermometer on something this small. Furthermore you can't use an IR thermometer on shine objects like an Al heatsink. It wouldn't hurt to mention what MOSFET you're using. Breadboards don't do well with heat so having anything that gets hot or carries a high current on a breadboard is not the best option.

larsgregersen
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