What do these do? Can I still cut the cables and fit an on/off switch?Little round gadgets holding what appear to be magnets around cables from mains transformers to freeview box?These are ferrous RFI (Radio Frequency Interference) filters. Their function is to reduce the amount of interference generated by the power supply which is no doubt a "switching" type unit and they produce a huge amount of RFI.
To demonstrate this, take a portable AM radio, turn it on near the low end of the band and place it near the power supply. Your radio will buzz like crazy.
Splicing in a an ON-OFF switch will cause no problems or change the way the filters work.Little round gadgets holding what appear to be magnets around cables from mains transformers to freeview box?They are not magnets, but interference filters - made out of ferrite cores. Do not remove.
If you don't know about electricity - don't monkey with it - you can kill yourself if you don't fit the switch correctly.
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