Output calculator program
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 Planars & Exotics ESL's, planars, and alternative technologies

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 16th December 2005, 10:47 PM #1 diyAudio Member     Join Date: Nov 2005 Location: Vilnius Output calculator program Hi, My new Output transformer calculation program can be found at http://bazukaz.puslapiai.lt/ It would be great if somebody could test if it works correctly. Regards , Lukas
 17th December 2005, 12:22 AM #2 diyAudio Member   Join Date: Nov 2005 Location: Southern Germany Hi bazukaz, is that calculator meant for stepup transformers for ESL ? If yes, there seems to be no dependency on magnetic permeability of the core alloy. For frequency transformers the permeability impacts the lowest frequency to be transformed, since the primary inductance is a result of coil diamter, length of magnetic field and permeability. I guess your calculator is based on standard transformer calculation. capaciti
 17th December 2005, 12:58 AM #3 diyAudio Member     Join Date: Nov 2005 Location: Vilnius Hi, It is for stepup transformers. I used formulas for standard tube amplifier output trannies as described at http://www.valveheart.com/theory/transformer.html Surprisingly , there is no permeability included in these formulas. I think formulas are used for standard steel cores. However , i think that i will have to include permeability in program as well , if i find full formulas.
 21st December 2005, 12:10 AM #4 diyAudio Member     Join Date: Nov 2005 Location: Vilnius Also , what do you think about air-core transformers ? I think they should work okay for higher frequencies , say 300-500 hz and above.
 21st December 2005, 07:07 AM #5 diyAudio Member   Join Date: Nov 2005 Location: Southern Germany Hi Bazukaz, air core is best because there is no saturation of the magnetic field. But you need a lot of windings to achieve appropriate inductance of the primary winding. Even for 300 Hz you still need about 3mH, which might require about 300 windings for a small diameter coil. Now you will need 30000 for 1:100 secondary. This will be a llarge secondary winding suffering from bad coupling and, more critical, from a significant capacity. capaciti
 21st December 2005, 05:30 PM #6 diyAudio Member     Join Date: Nov 2005 Location: Vilnius Yes , i know this problem of large capacity. I imagine core-less transformer as an inductor. Number of primary turns can be greatly decreased by making diameter bigger.However , this does not affect total wire length by much , and capacitance would still be large.Separating transformer into sections would decrease capacitance, but greatly increase leakage inductance , wouldn't it ?

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