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Harbor Freight inverter deal and quick review
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<blockquote data-quote="Blitzfike" data-source="post: 2580678" data-attributes="member: 807"><p>After looking at the prices of isolation transformers on the interweeb, I have come to the conclusion that it is far better for me to find two junk microwave ovens, (try to get both of them at the same power rating) being careful to discharge the capacitor inside each one before putting my sensitive little pinkies in harms way, (There can still be lethal charges on them even months after they are unplugged if the bleeder resistor across them is faulty) after removing the big transformers, carefully cut the weld holding the top of the iron laminations on the transformers, then cut away the high voltage winding (its the one with the very small wire) do the same to the second transformer, and then carefully remove the primary winding from one and stack it above the primary winding on the first transformer. You will need to use small wooden wedges to secure the windings to the core if they are loose. Replace the portion of the iron core removed to get at the windings, and weld it back in place. (Most of you don't have welders so get with those of us who do.) The finished transformer is now a 1 to 1 isolation transformer and its current rating will equal what the microwave's power rating was. 650 watts for a small one or 1100 watts for a big one. I built a pretty powerful spot welder from an 1100 watt microwave, instead of adding an additional primary winding, I wound as many turns of #6 gauge wire as I could in the core area left.</p></blockquote><p></p>
[QUOTE="Blitzfike, post: 2580678, member: 807"] After looking at the prices of isolation transformers on the interweeb, I have come to the conclusion that it is far better for me to find two junk microwave ovens, (try to get both of them at the same power rating) being careful to discharge the capacitor inside each one before putting my sensitive little pinkies in harms way, (There can still be lethal charges on them even months after they are unplugged if the bleeder resistor across them is faulty) after removing the big transformers, carefully cut the weld holding the top of the iron laminations on the transformers, then cut away the high voltage winding (its the one with the very small wire) do the same to the second transformer, and then carefully remove the primary winding from one and stack it above the primary winding on the first transformer. You will need to use small wooden wedges to secure the windings to the core if they are loose. Replace the portion of the iron core removed to get at the windings, and weld it back in place. (Most of you don't have welders so get with those of us who do.) The finished transformer is now a 1 to 1 isolation transformer and its current rating will equal what the microwave's power rating was. 650 watts for a small one or 1100 watts for a big one. I built a pretty powerful spot welder from an 1100 watt microwave, instead of adding an additional primary winding, I wound as many turns of #6 gauge wire as I could in the core area left. [/QUOTE]
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