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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: transformer placement in circuit posted by Damon on May 25, 2000 at 08:33:30:
You are confusing electrostatic shield with magnetic one.Electrostatic shield does nothing to magnetic field radiation from the transformer that will be picked up by pretty much everything inside the box. This magnetic flux leakage is the most severe form of transformer radiation and noise.
Different transformers radiate differently and most E-I types do radiate most along their core centerline. Take any coil (any relay coil will do) and connect it to the oscilloscope, then use it as a marnetic field probe. Move it around the transfoemer and find where it radiates most. Transformer should be under load. Conclusion - transformers should be oriented properly.
Toroids radiate less, but still do.
Magnetic shields can be effective and can take several forms:
1. Soft steel can - expensive and rarely used.
2. Shorted copper turn - used often on good equipment. The turn is on the outside and is in the same direction as the winding.
3. Magnetic shield on toroids - usually consists of three or more turns of core material tape on top of the winding - usually is *very* effective.
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Follow Ups
- Shileds and more shields - Victor Khomenko 13:42:05 05/25/00 (2)
- Re: Shileds and more shields - bobwire 10:21:05 05/26/00 (1)
- Re: Shileds and more shields - Victor Khomenko 13:06:33 05/26/00 (0)
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