I have been needing some transformere models and I can't figure out how to make my own. I was wanting models for supply transformers mostly, but I also want some for audio like 1Kohm primary (center-tapped), 8ohm secondary. For the supply trannies I want 120:13.8, 120:60, 120:30, 120:5, (all preferably center-tapped) and some others if possible. I have attempted to make my own but I can't figure out how to make LTSpice/SWCADIII associate my subcircuits with my symbols. If you post a model, please tell me which nodes are the parts of the transformer.
Kean,
Transformers models are a bit tough. You build them by using 2 inductors and then linking them with "coupling coefficient'. The rub is... the models must change with the power level of the transformer... so, you would need a zillion models.
What you can do in most situations is to use an AC voltage source instead. You can even place resistors in series with each branch of the AC source to mimic the winding resistance of a real transformer.
🙂
Transformers models are a bit tough. You build them by using 2 inductors and then linking them with "coupling coefficient'. The rub is... the models must change with the power level of the transformer... so, you would need a zillion models.
What you can do in most situations is to use an AC voltage source instead. You can even place resistors in series with each branch of the AC source to mimic the winding resistance of a real transformer.
🙂
Wouldn't there be an equation that could be used to keep from having to use a zillion different models? If I can get an equation like that, I could probably make an accurate transformer model... I think I will use your advice though, I will use some of my transformer symbols for more "official" diagrams.
Thanks!
Thanks!
keantoken,
No offense intended, but a worthwhile transfomer model is way beyond what you will be able to understand. I suggest you focus on simple transistor biasing. After you understand that backwards and forwards, you will be ready to talk about differential amplifiers (LTP) and their biasing. Then you need
to understand reactances and AC circuit behaviour. Then AC gain. Then feedback networks. Maybe you will be able to understand transformers in a couple of years.
Have you really studied any of the links peoplehave been sending you?
Rick
No offense intended, but a worthwhile transfomer model is way beyond what you will be able to understand. I suggest you focus on simple transistor biasing. After you understand that backwards and forwards, you will be ready to talk about differential amplifiers (LTP) and their biasing. Then you need
to understand reactances and AC circuit behaviour. Then AC gain. Then feedback networks. Maybe you will be able to understand transformers in a couple of years.
Have you really studied any of the links peoplehave been sending you?
Rick
I understand that I need to learn the basics before moving on to more complex things, but I am still permitted to ask a few questions! Semiconductors and their role in design is still somewhat a mystery to me but I can understand AC circuit behaveour pretty well when I set my mind to it and am not given horrible resources such as "Teach Yourself Electricity and Electronics-Third edition by Tab Electronics" - which tells nothing about biasing transistors while still dedicating a whole chapter to amplifiers, and going more into detail about AC circuit behaveour than any other topic in the book! It kind of makes you wonder if the writer knows anything himself, and doesn't just get information off of miscellaneous resources without even understanding it! This is the book which got me started in amplifier design - and did a pretty horrible job of it too. 
I understand that you want to help me improve, but you need to give me some space. There is nothing wrong with a bit of curiosity, which is the reason I started this post.
No offense intended, but I don't want you following me around so closely anymore. I cannot hope to become a competent designer if everybody follows me around and tells me what I should do and use in my designs as well as the way I should think and react to problems in my ideals.
Again, no offense intended, but sometimes the student can see the forest while the mentor only sees a few deer, a butterfly, and an old sofa laying on the ground. I do not wish to offend anyone in any way, shape or form, but I think it is the duty of a mentor to take a few steps back and see the whole picture of what the student is capable of before making important decisions.
With no offense intended or hoped,
Anthony Tuttle
I understand that you want to help me improve, but you need to give me some space. There is nothing wrong with a bit of curiosity, which is the reason I started this post.
No offense intended, but I don't want you following me around so closely anymore. I cannot hope to become a competent designer if everybody follows me around and tells me what I should do and use in my designs as well as the way I should think and react to problems in my ideals.
Again, no offense intended, but sometimes the student can see the forest while the mentor only sees a few deer, a butterfly, and an old sofa laying on the ground. I do not wish to offend anyone in any way, shape or form, but I think it is the duty of a mentor to take a few steps back and see the whole picture of what the student is capable of before making important decisions.
With no offense intended or hoped,
Anthony Tuttle
That said, one question: does a transformer create a phase shift of 180? My reasoning is - since a coil does not create any current when exposed to an unvarying electromagnetic field, I would think that the response would be proportional to the rate of change (delta). This means that when the wave is at it's peak, and is completely still for the infinitely small amount of time, the output of the transformer would be 0, since the electromagnetic field is unvarying at that point. And when the wave is in it's full swing downward, the output of the transformer would be at it's peak, because the field is in full variation. I am asking this because I have an idea for an oscillator - type circuit.
Also, I have studied those links and find them hard to understand at my current state as I have gone the whole summer without doing my mathematics myself and always using my graphing calculator. It will take a while to get as good at mathematics as I once was. Please be patient with me. 😉
I've just been trying to get you to 'wake up' and realize that you need to study. If you don't want to do that, it's ok with me. So long.
analog version-
might just do the old fasion way-
robert l shraders book, electronic communication tells how
like this-
ebay item-140029083527
early versions have more tube info
might just do the old fasion way-
robert l shraders book, electronic communication tells how
like this-
ebay item-140029083527
early versions have more tube info
I'm sorry everybody, but my schoolwork and this stuff interfere A LOT. It is hard to concentrate on electronics because of this. I will try to find some webpages but no one tells me what of the basics I am missing and I can't figure that out for myself.
I didn't want you to take that harshly, sawreyrw, as you seemingly did. I just wanted you to know that I wasn't being ignorant of my evident problems and was trying to get myself together and figure out how to fit it all together. I will never quit trying to understand this unless everybody else quits out on me! And I will stay loyal to anyone who is willing to help me reach my goal. I didn't mean for you to completely quit out on me! I just didn't want you following me so closely. Sorry if I have failed you, sawreyrw...
I didn't want you to take that harshly, sawreyrw, as you seemingly did. I just wanted you to know that I wasn't being ignorant of my evident problems and was trying to get myself together and figure out how to fit it all together. I will never quit trying to understand this unless everybody else quits out on me! And I will stay loyal to anyone who is willing to help me reach my goal. I didn't mean for you to completely quit out on me! I just didn't want you following me so closely. Sorry if I have failed you, sawreyrw...
Thank you, tomtt, for ignoring our immature childlike dispute! *breathes a long, drawn-out sigh of relief*
I just hope he hasn't gone as far as to put me on his censored list, though... I would still appreciate some helpful comments from him, even if I have to swallow my pride and admit to my evident lack of understanding.
I just hope he hasn't gone as far as to put me on his censored list, though... I would still appreciate some helpful comments from him, even if I have to swallow my pride and admit to my evident lack of understanding.
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