Frequency Plots
30% Fan Speed
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There is a frequency spike at 50 Hz, and the region between 200Hz and 315Hz is also high.
40% Fan Speed
The highest frequency is at 315 Hz.
50% Fan Speed
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The two peaks here are at 400 Hz and 800 Hz.
75% Fan Speed
800 Hz is the highest frequency.
100% Fan Speed
At full speed, the highest frequency is 1 KHz, so the output noise will be annoying.
Signal Recordings
I have recorded the signals shown above, but please keep in mind that I’ve enabled Automatic Gain Control (AGC) to do so to make it easier for you to reproduce them. The provided recordings are only offered for aural identification purposes.
30% Fan Speed
40% Fan Speed
50% Fan Speed
75% Fan Speed
100% Fan Speed
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