Quote:
Originally Posted by s1900ahon
The sound of the switch-mode supplies will be higher pitched and may change frequencies based on the current being drawn. This may be caused by the most popular robot construction sin -- metal debris in the electronics.
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A spotty power supply would give you intermittent control and produce the sound you describe. If you can, replace the PDB completely; if not, your best option is to either send it in for a replacement or if that's not possible, open it yourself and clean out swarf.