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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: 52988" data-attributes="member: 817"><p>Ok, so let us look a the bobbin.</p><p></p><p>I use the so called "loose lead nylon bobbins". </p><p></p><p><img src="http://www.amccores.com/images/24bm.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The AMC website is shy with the dimensions of the EI96 bobbins, so I consulted the printed catalog:</p><p></p><p>It is called a 78A type bobbin (or 1-1/4") . For the 32/32 bobbin we have</p><p></p><p> A B C D E</p><p> 32.5 32 63.5 44 1.5</p><p></p><p>We want to roll copper onto the bobbin, filling as much of the available space as possible, but not exceed the height of the window, otherwise the copper windings will scratch against the laminations and cause a short circuit.</p><p></p><p>From the data item E (1.5mm) we know how thick the plastic is. So I take it that there is a 1.5mm layer of plastic around the core.</p><p></p><p>So the available height is value C - A thus: 63.5-32.5=31</p><p></p><p>This is the value for both side added together, so half for a single window 31/2=15.5mm</p><p>Subtract the thickness of nylon at the bottom of the bobbin, thus 15.5-1.5=14mm</p><p></p><p>For our calculations, I am going to assume we have 14mm bobbin height available to roll copper onto.</p><p></p><p>Bobbin width is easy: value D (44mm)</p><p></p><p>So next we have to calculate the Mean Turn Length....</p></blockquote><p></p>
[QUOTE="Mars, post: 52988, member: 817"] Ok, so let us look a the bobbin. I use the so called "loose lead nylon bobbins". [IMG]http://www.amccores.com/images/24bm.gif[/IMG] The AMC website is shy with the dimensions of the EI96 bobbins, so I consulted the printed catalog: It is called a 78A type bobbin (or 1-1/4") . For the 32/32 bobbin we have A B C D E 32.5 32 63.5 44 1.5 We want to roll copper onto the bobbin, filling as much of the available space as possible, but not exceed the height of the window, otherwise the copper windings will scratch against the laminations and cause a short circuit. From the data item E (1.5mm) we know how thick the plastic is. So I take it that there is a 1.5mm layer of plastic around the core. So the available height is value C - A thus: 63.5-32.5=31 This is the value for both side added together, so half for a single window 31/2=15.5mm Subtract the thickness of nylon at the bottom of the bobbin, thus 15.5-1.5=14mm For our calculations, I am going to assume we have 14mm bobbin height available to roll copper onto. Bobbin width is easy: value D (44mm) So next we have to calculate the Mean Turn Length.... [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
DIY Simple Output Transformer
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