CWChristof Windeck

1. Article · Aug 31, 2026 · Christof Windeck

   GaN Transistors for Audio Power Amplifiers: Audiophile and Automotive (opens the original)

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   Field-effect transistors (FETs) made of the semiconductor material gallium nitride (GaN) are currently primarily used in switching power supplies and other voltage converters. However, they also promise advantages for so-called “Class D” audio amplifiers because they switch at high frequencies with low losses. Switching frequencies in the range of 800 kHz to over 1 MHz are far above the frequency range of audible sound vibrations, which extends up to 20 kHz for very young people. The high GaN sw

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2. Article · Aug 14, 2026 · Christof Windeck

   Side channel allows access to RAM of AMD security controller PSP (opens the original)

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   For the security concept of modern computers, the secure isolation of certain address ranges of the main memory is essential. Expert Christopher Domas, aka “xoreaxeaxeax”, now demonstrates that this isolation does not work in old AMD processors of the so-called Family 16h. This allows read and write access to actually reserved RAM address ranges of security functions such as AMD Platform Security Processor (PSP), System Management Mode (SMM), or CPU microcode. A higher risk of attacks on compute

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