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Old 7th June 2010, 09:55 AM   #11
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Ok so I guess its not worth the effort. I have a question though Ive seen many isolation transformers that are used stop rf noise from entering the AC wiring and most of these use toroidal transformers how do these stop rf noise from going back to the mains?
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Old 7th June 2010, 10:20 AM   #12
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Quote:
Originally Posted by SilverStrings View Post
Ok so I guess its not worth the effort. I have a question though Ive seen many isolation transformers that are used stop rf noise from entering the AC wiring and most of these use toroidal transformers how do these stop rf noise from going back to the mains?
The good ones only use EI types for mid band (audio) noise rejection, At RF frequencies they all use shielded cans or IEC line modules containing LC filters and common mode chokes. Any isolation XFMR using toroid's would need additional filtering to match a split bobbin with physically separated input and output windings.
Isolation only requires the pri-sec windings meet some 1500 V leakage current ie well insulated from each other. Line conditioner XFMRs need more than that. These will usually spec a capacitance and have a electrostatic shield. In order for the electrostatic shield to be effective it needs dedicated reference earth grounds.
see here
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Last edited by infinia; 7th June 2010 at 10:31 AM.
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