Actually an EI style transformer will not couple high frequency hash on the AC line as well as a "doughnut" type. But they tend to put out more electrical fields and are physically larger. Personally I like EI better.
Russ
63.251.152.4
In Reply to: Re: Try Amveco #AA56252-038 posted by Granholm on March 2, 2006 at 11:41:39:
Yes, in my experience having a transformer capable of more current than you need makes a nice difference, but I see no point in going past 200%(I guess for you that is about almost 1,000VA tops?). One advantage is that the larger a transformer is the better it's regulation, the difference between loaded and unloaded voltage. So I think it makes for a stiffer supply. Cobalt's big advantage is lower core loss. That is not important to you unless you plan to own a power company and have a bunch of transformers:) Cobalt will have a bigger inrush current and that will already be a problem using "doughnut" transformer. So for the inrush reason I say don't bother with cobalt. Save the fancy core materials for audio coupling transformers such as those used in tube amps. Even then I'd suggest M4 and/or nickel.Actually an EI style transformer will not couple high frequency hash on the AC line as well as a "doughnut" type. But they tend to put out more electrical fields and are physically larger. Personally I like EI better.
Russ
Follow Ups: