Switchmode power supplies & radio interference

摘要

I noticed the linear voltage regulator supply article in the May 2015 issue. It should be benign as far as radio interference is concerned. By contrast, most switchmode (buck) supplies cause FM-band interference and this can be problem with dashcams and GPS units. Have you performed any spectra analyses on switchmode units? Currently, the UBEC model aeroplane switchmode power supply has the lowest interference we have been able to source.