Electronic coupled noise: Difference between revisions
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: Conductive/resistive, in that it's its direct output | : Conductive/resistive, in that it's its direct output | ||
: also often inductive/capacitive, because it's a bunch of current on wires nearby | : also often inductive/capacitive, because it's a bunch of current on wires nearby | ||
In the presence of rectification, there is a strong peak at 50 and 100Hz or 60 and 120Hz as well, | In the presence of rectification, there is a strong peak at 50 and 100Hz or 60 and 120Hz as well, | ||
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Switch-mode power supplies | Switch-mode power supplies ''in theory'' operate at dozens or hundreds of kHz, | ||
This tends to be ~60-100dB{{verify}} away for most frequencies but can be much closer for some. | which should avoid audio-frequency noise. | ||
...but even if they do they can still have some intermodulation, | |||
which is the interaction of different internal frequencies to cause some signal at lower and higher frequencies. | |||
This tends to be ~60-100dB{{verify}} away for most frequencies - but can be much closer for some. | |||
This is why switch-mode have a reputation that they're too noisy, though this depends on quality. | This is why switch-mode have a reputation that they're too noisy, though this depends on quality. | ||
Revision as of 16:35, 19 April 2024