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Karl, your comment on switchmode power supplies may have some relevance with regard to CCD sameras, however I doubt that you would find much, if any, high frequency ripple on most switchmode power supply outputs. Remember, the popular webcams used for planetary all run from USB ports, often powered from switchmode power supplies and PC soundcards also run from switchmode supplies. Many high end hi fi amps also use swich mode power supplies. A more likeley path for interference is RF. As Andrew points out, switchmode power supplies can produce high levels of RF interference, but it's not that hard to suppress such interference with some shielding, torroids and RF suppression caps on the output leads.
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