300W Plate Amplifier
An experiment with HEXFETs.
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The amplifier heatsink dictated the lower left corner space requirements, so I cut that first, knowing the rest had to at fit around it somehow. I was fortunate to find a suitable sheet of aluminum for this project, which eliminated the need to beg large favors involving CNC laser tables and heavy steel:

Test layout
Figure 15. Testing a possible layout.

The fully assembled layout on the inside:

Linked boards
Figure 16. Fully assembled plate amplifier, interiror view.

The fully assembled layout, as viewed from the user interface side:

Linked boards
Figure 16. Fully assembled plate amplifier, exteriror view.

A few more screw penetrations than I would like to see, but all things considered, it's a pretty clean layout in light of how much stuff is actually supported by the plate.


It seemed my work was done. The amplifier had successfully tested at over 300W into 8Ω, which was my primary design goal. The assembled plate amplifier was tested repeatedly on the bench, and all systems were functioning normally.

Unfortunately, about five seconds after it was fired up in the cabinet my friend had built for it, disaster struck.

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