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The original was posted on /r/askelectronics by /u/gamefile22 on 2023-08-07 19:27:55+00:00.

The converter switches with a frequency of 60khz yet the voltage changes in a revze sawtoth patern with about 2Hz of frequency.the input is clean.i added a rezistor to drain the filter cap, when I change it for a smaller one it fluctuates faster, when I add a load it levels completely.im afraid it’s because the frequency of the noize gets so big the filter cap filters it.is that the case?is there a way around it.