If you meant more than 9000 cycles per second, yes, that would be
classified as a digital device under FCC Part 15. SMPS are not likely to
switch at that frequency. More typically, they switch at rates above 30
kHz, well beyond audio frequencies.
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Yes, a switchmode power supply falls under FCC part 15. Also, if by
timing signals you are referring to its switching frequency, I think
you have lost a zero somewhere. No switchmode power supply operates in
the audible frequency range around 9KHz or 10KHz (especially one used to
operate a
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