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Old 25th July 2013, 06:00 PM   #1
KJ5555 is offline KJ5555  United States
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Unhappy Audio Transformer Spice Model

I need to create this transformer, which I have attached, for my circuit. However, this transformer is not in multisim, which I am brand new to.

I have been trying to use this audio transformer model I found:
.SUBCKT ts_audio_ideal 1 2 3 4 5
* EWB Version 4 - Transformer Model
* n= 2 Le= 1e-006 Lm= 0.001 Rp= 1e-006 Rs= 1e-006
Rp 1 6 1e-006ohm
Rs1 10 3 1e-006ohm
Rs2 11 5 5e-007ohm
Le 6 7 1e-006H
Lm 7 2 0.001H
E1 9 8 7 2 0.25
E2 8 4 7 2 0.25
V1 9 10 DC 0V
V2 8 11 DC 0V
F1 7 2 V1 0.5
F2 7 2 V2 0.5
.ENDS


However, this is only referring to having 5 pins. One primary and one tapped secondary. Since I have a transformer that has four primary and two primary which are tapped, how would I go about changing this model. I was thinking that it could be represented by 4P4S. Also how would I go about changing the turns.

Thanks so much!
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Old 25th July 2013, 07:10 PM   #2
KJ5555 is offline KJ5555  United States
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I have tried just using a 4P4S model and then putting in the number of turns and resistance (which are all incredibly low) and the transformer keeps burning up all the resistors. This transformer is supposed to be a step-up and is placed at the end of an amplifier circuit. Please help!
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Old 29th July 2013, 03:37 PM   #3
djoffe is offline djoffe  United States
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If you give a bit more of the overall context, people might be better able to chime in and help.
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Old 31st July 2013, 09:18 AM   #4
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You can only specify the winding ratio in-directly by providing the inductances of the windings, you will need the following parameters to build the model:

Primary end-to-end inductance, assuming it is center tapped, then the mid-point would be half of the inductance, ditto for the secondary, you need to specify the end-to-end inductance, and define where the tap appear on the winding, again in inductance value. The primary and secondary winding resistances should also be included for improved accuracy, if you have those figures, put them in, otherwise, use some generic values such as 250R for the primary and 1R for the secondary.

If you can provide those figures, we can help you to come up with an usable model. Or if you have the model number for the transformer, there might already be a model available, you never know...
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Old 31st July 2013, 04:56 PM   #5
KJ5555 is offline KJ5555  United States
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Could you give me an idea as to how I would go about measuring the inductance? I tried using a LCR meter and it was giving me small uH measurements...
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Old 2nd August 2013, 06:35 PM   #6
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On the road now, otherwise I would post a few links that I have collected... But try doing a search on this site as well as over at audiokarma, there should be some threads or links for you to follow.
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Old 17th November 2013, 04:18 PM   #7
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Hi,
Here are a few PSpice models for some commercially available output transformers.
Use with care, and remember that these models are a simplified approach to the real world.
Enjoy!
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