On page 3 of this link, anybody have an idea of how they came up with the 1200 number when calculating the number of turns for the primary winding? I believe they are referring to footnote 2. However, that publication appears to not be available online so the formula from the book is unknown.
https://www.google.com/url?sa=t&rct...al_paper.pdf&usg=AOvVaw0ooHN0ysZKD9UeO_sRO6Zi
https://www.google.com/url?sa=t&rct...al_paper.pdf&usg=AOvVaw0ooHN0ysZKD9UeO_sRO6Zi
Thanks Paul. I searched Hanna curves and this link has the clearest explanation of how the curves can be used to calculate turns required.
https://www.google.com/url?sa=t&rct...ntoboost.pdf&usg=AOvVaw01VwAbYQIAAquk0pjurZ6t
https://www.google.com/url?sa=t&rct...ntoboost.pdf&usg=AOvVaw01VwAbYQIAAquk0pjurZ6t
These fellows are designing the output transformer as they have learned how to calculate the ferrite core inductor . The datasheet of ferrite cores give the sq,rt Henry/turn , after which you can calculate the number of turns to get the required value. Certainly they put a paper as air gap , wind about ten turns, and measure the inductance to deduce the 1200 value. To have better explanation of how to calculate SE transformers I advise you the Radiotron , free download. Warning. It is not as easy to understand.
I have … a question … that's been bothering me for years.
What would be the drawback of having either a CHOKE LOAD for the finals, or a auto-adjusting constant-current regulator (ideally 'shooting' for 60% of B+ as the quiescent operating point) then → → high value, non-polar capacitor → standard issue “single ended triode” output transformer … → out.
The idea is, have the quiescent current shunted away from the output transformer, leaving it to “transform the AC signal”, without the DC component.
Especially if a constant current regulator is employed, it seems like an almost (but not quite) perfect fit.
The use of a choke load instead has the advantage of running the triode way closer to its maximum voltage rating (and above!). But still … its more iron, more cost, a lot more mass and space. Might have been the only way to accomplish this before say 1975 or 1980, with the invention of really good CCS's made from FET/MOSFET technology. Depletion mode devices with really, rally flat 'pentode' signatures.
Just asking,
-= GoatGuy ✓ =-
What would be the drawback of having either a CHOKE LOAD for the finals, or a auto-adjusting constant-current regulator (ideally 'shooting' for 60% of B+ as the quiescent operating point) then → → high value, non-polar capacitor → standard issue “single ended triode” output transformer … → out.
The idea is, have the quiescent current shunted away from the output transformer, leaving it to “transform the AC signal”, without the DC component.
Especially if a constant current regulator is employed, it seems like an almost (but not quite) perfect fit.
The use of a choke load instead has the advantage of running the triode way closer to its maximum voltage rating (and above!). But still … its more iron, more cost, a lot more mass and space. Might have been the only way to accomplish this before say 1975 or 1980, with the invention of really good CCS's made from FET/MOSFET technology. Depletion mode devices with really, rally flat 'pentode' signatures.
Just asking,
-= GoatGuy ✓ =-
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