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Old 31st December 2003, 05:19 AM   #21
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Join Date: Aug 2002
Location: Belgium
Hi,

Quote:
Can no-one utter anything you don't understand?
Ohh...No doubt about it...

Languages, just as electronics (I'd replace that with audio) are fun...
It just so happens I happen to enjoy both.

Thank you very much for the compliment, Hugh and...

Happy New Year,
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Frank
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Old 31st December 2003, 09:25 AM   #22
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Location: Alps:Tube amp designs over 150W, SMPS guru.
The 120-0-120 AC supply is probably done on resident safety grounds...(could be wrong on this) I heard this idea some time ago when I was in Efore (Fin).....but never thought it would come in practice........ Frank must be living in a pretty posh area....The real world is as kind as it is cruel.........my AC voltage varies from 206V to 245V AC, hence my forte in SMPS.
However the problem with screening toroids is that the electrostatic screen often comes as a dummy winding for safety, the massive inductance then has no dumping effect on interwinding capacitance. The screen must be a low inductance, to be really effective and that's awkward winding sheet on a tangent curve.
Facit.....E&I cores are the best for this........As to XY caps, these are agency rated and classed, I never known one to short circuit or go open in normal use.
Everyone have a happy new year........we have snow in the forum.
r
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