The housing came off with a screech of sheared aluminum. Inside, the ET 3760 was beautiful—a perfect chaos of surface-mount components, copper planes shaped like fractals, and a single, massive MOSFET array at its heart. And there, near the gate drive transformer, I saw it. A tiny crack. Not in a chip. In the PCB itself . A hairline fissure where thermal expansion over thousands of cycles had finally torn the substrate apart.
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The ET 3760 isn’t just a driver. It’s a heartbeat. The housing came off with a screech of sheared aluminum