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Audio and Video Talk
Valves / Vacuum Tubes
DIY Simple Output Transformer
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<blockquote data-quote="Mars" data-source="post: 58388" data-attributes="member: 817"><p>So... onto the Mean Winding/Turn Length</p><p></p><p>The Mean Turn is half way from the base of the bobbin to the top. With a Bobbin Height of 14mm, the Mean Turn is 7mm from the bobbin base.</p><p></p><p>From the bobbin dimensions we have "A" which is an inner dimension. On the wire side/outer surface of the path length is twice the thickness of the bobbin material longer: so A+1.5+1.5=35.5mm. The Mean Turn runs 7mm above this surface, so the length of wire is 35.5+7+7=49.5</p><p></p><p>The same applies to dimension "B". The outer dimension of the " B" side is actually 32+1.5+1.5=35. The mean turn runs 7mm above this, thus 35+7+7=49.</p><p></p><p>This makes sense, since the core is square. There is a little bit more "play" on the "A" side so the laminations can slide into the bobbin.</p><p></p><p>So the Mean turn length is 49.5+49+49.5+49=197mm</p><p></p><p>The software wants a "cm" dimension, so we enter 19.7 cm into the table and click "save"</p><p></p><p>The data is now available as an option to select when doing OPT design</p></blockquote><p></p>
[QUOTE="Mars, post: 58388, member: 817"] So... onto the Mean Winding/Turn Length The Mean Turn is half way from the base of the bobbin to the top. With a Bobbin Height of 14mm, the Mean Turn is 7mm from the bobbin base. From the bobbin dimensions we have "A" which is an inner dimension. On the wire side/outer surface of the path length is twice the thickness of the bobbin material longer: so A+1.5+1.5=35.5mm. The Mean Turn runs 7mm above this surface, so the length of wire is 35.5+7+7=49.5 The same applies to dimension "B". The outer dimension of the " B" side is actually 32+1.5+1.5=35. The mean turn runs 7mm above this, thus 35+7+7=49. This makes sense, since the core is square. There is a little bit more "play" on the "A" side so the laminations can slide into the bobbin. So the Mean turn length is 49.5+49+49.5+49=197mm The software wants a "cm" dimension, so we enter 19.7 cm into the table and click "save" The data is now available as an option to select when doing OPT design [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
DIY Simple Output Transformer
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