On 30/01/17 23:00, Alan Corey wrote:
Biscuit tin or similar would do, ocuple of large ferrite cores and wind the usb cables toroidally?
One question I've had for years about using big toroids for suppression is this: If you've got a cord that you don't want to take the connector off to fit through the toroid, does it do the same amount of good to just double a few feet of it back on itself and feed that through the toroid? Or do the magnetic fields oppose each other because the currents are flowing in opposite directions?
You can get split toroids (i.e. two C-shaped lumps) that are held together with a plastic shell, specifically for retrofitting to troublesome kit to bring it in line with required levels of emission and sensitivity.
-- Mark Morgan Lloyd markMLl .AT. telemetry.co .DOT. uk [Opinions above are the author's, not those of his employers or colleagues]
