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Line Level Isolation Transformers
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<blockquote data-quote="Frank Koenig" data-source="post: 49363" data-attributes="member: 416"><p>Re: Line Level Isolation Transformers</p><p></p><p>I agree with the notion of losing the "ground lift" switch and leaving the grounds permanently disconnected. As you point out, that's why you're using an iso transformer in the first place.</p><p></p><p>One thing that occurred to me (in the honored engineering tradition of solving problems you don't have) is to use a transient voltage suppressor between the grounds of the two sides, in addition to a small RF bypass cap. This would help protect the transformer, cap, and, perhaps, personnel from voltage spikes.</p><p></p><p>This is a timely thread as I, too, am about to build some isolation boxes around some junk box, er, I mean vintage, transformers. (UTC A-22s in my case.)</p><p></p><p>I'll probably bond the output side ground to the case for electrostatic shielding on mine, but understand the case for not doing so.</p><p></p><p>--Frank</p></blockquote><p></p>
[QUOTE="Frank Koenig, post: 49363, member: 416"] Re: Line Level Isolation Transformers I agree with the notion of losing the "ground lift" switch and leaving the grounds permanently disconnected. As you point out, that's why you're using an iso transformer in the first place. One thing that occurred to me (in the honored engineering tradition of solving problems you don't have) is to use a transient voltage suppressor between the grounds of the two sides, in addition to a small RF bypass cap. This would help protect the transformer, cap, and, perhaps, personnel from voltage spikes. This is a timely thread as I, too, am about to build some isolation boxes around some junk box, er, I mean vintage, transformers. (UTC A-22s in my case.) I'll probably bond the output side ground to the case for electrostatic shielding on mine, but understand the case for not doing so. --Frank [/QUOTE]
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