Frequency Plots
| Fan Speed (PWM) | Peak Frequency |
|---|---|
| 10% | 5 KHz |
| 25% | 5 kHz |
| 50% | 400 Hz |
| 75% | 630 Hz |
| 100% | 400 Hz |
10% Fan Speed
- Peak frequency: 5 kHz (the 50 Hz spike is probably due to the mains grid)
25% Fan Speed
- Peak frequency: 5 kHz
50% Fan Speed
- Peak frequency: 400 Hz
75% Fan Speed
- Peak frequency: 630 Hz
100% Fan Speed
- Peak frequency: 400 Hz
Signal Recordings
I’ve recorded the signals shown above, but please note that I’ve enabled Automatic Gain Control (AGC) to facilitate their reproduction. The provided recordings are intended for aural identification purposes only.
10% Fan Speed
25% Fan Speed
50% Fan Speed
75% Fan Speed
100% Fan Speed
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