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Audio and Video Talk
Valves / Vacuum Tubes
DIY Simple Output Transformer
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<blockquote data-quote="Ampdog" data-source="post: 45884" data-attributes="member: 144"><p>Not really (I would imagine that Karel will agree). It only <em>seems</em> so for those who do not really understand all the relevant factors. As will be evident from Karel's description, e.g. space between layers etc. has an influence on leakage reactance and interwinding capacitance, thus consistent results would require neat winding and assembly. E.g. quite a difference in leakage can be had with 'loose' windings. In that sense it can <em>appear</em> as an art. I take the sometimes frowned upon route of afterwards compressing the windings on the flat sides to go into the core - dimensions on the rounds indicate that the necessary space is there. There is no such thing as 2 - 3% tolerance in transformers as e.g. with resistors and capacitors. Winding ratio; Yes, but not regarding internal capacitance and leakage reactance. 10% tolerance is not unusual and should be catered for in the amplifier design.</p><p></p><p>I myself use the approach in Radio Designer's Handbook (IV) (originally from Norman Crowhurst) and has never found that wanting. That uses a number of graphs. Earlier Karel quoted a suitable PC programme. Let us bear with him as he continues. He is doing a good job.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 45884, member: 144"] Not really (I would imagine that Karel will agree). It only [I]seems[/I] so for those who do not really understand all the relevant factors. As will be evident from Karel's description, e.g. space between layers etc. has an influence on leakage reactance and interwinding capacitance, thus consistent results would require neat winding and assembly. E.g. quite a difference in leakage can be had with 'loose' windings. In that sense it can [I]appear[/I] as an art. I take the sometimes frowned upon route of afterwards compressing the windings on the flat sides to go into the core - dimensions on the rounds indicate that the necessary space is there. There is no such thing as 2 - 3% tolerance in transformers as e.g. with resistors and capacitors. Winding ratio; Yes, but not regarding internal capacitance and leakage reactance. 10% tolerance is not unusual and should be catered for in the amplifier design. I myself use the approach in Radio Designer's Handbook (IV) (originally from Norman Crowhurst) and has never found that wanting. That uses a number of graphs. Earlier Karel quoted a suitable PC programme. Let us bear with him as he continues. He is doing a good job. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
DIY Simple Output Transformer
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