Total posts : 45366
yes i was using a dummy load and yes when i modulated the signal it started looking trapezoidal. can you recommend an article or website that explains the subtleties of the trapezoid. depending on how i adjust the audio level (R31) i see patterns such as a solid squiggly vertical line on the right side of the image. also at higher frequencies i see a weird horizontal line forming in the center of the pattern.
heres some images that indicate this. sorry the quality is bad, i had to use my phone. the patterns are more pronounced in real life than in the photos. both images are a 1V Pk-Pk sine wave input. the first image is at 400hz and the second one is at 4khz.
are these just signs of over modulation?