Transformer Flux Band Tips and Tricks?

[dsavitsk]

Can anyone offer any tips on how to add a flux band to a transformer? Do I just wrap some copper, or does it need to be electrically connected in some specific way? I am getting a tiny tiny bit of induced hum from the PT to the OPT and am looking to try this as a way to quiet things. Also, is this better to do on power transformers, or outputs, or both?

[makaiyumtony]

the simple way is to turn the direction of both transformers, there will have a point of the best
Tony Ma

[tvrgeek]

Or space, or , if the chassis is steel, raise them on some non-ferrous hardware like brass.

[kevinkr]

Use a copper strip that almost completely covers the bobbin window oriented so that it parallels the windings, pass it over the outside of the core - not around the bobbin otherwise this will look like a shorted turn. Should be snug against the outside of the windings and the core - solder where the ends meet. Check primary excitation current (no secondary windings connected) before and after (if the band is acting like a shorted turn the current will be very high relative to before) check for excessive heating.

I would use it only on the power transformer.

FWIW I'm quite sure Doug has taken all of the usual precautions, hence his question about the flux band.