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
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
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
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
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.
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.
Also , what do you think about air-core transformers ?
I think they should work okay for higher frequencies , say 300-500 hz and above.
I think they should work okay for higher frequencies , say 300-500 hz and above.
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
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
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 ?
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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