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In Reply to: RE: Purpose of these Caps? posted by Tre' on August 28, 2016 at 14:06:21
20uF means the caps aren't being used only to pass high frequencies. Large caps will shunt all signal across the transformer, effectively placing the primary and secondary in parallel. I don't know what the inductance of the windings is, but this looks awful in SPICE. A huge upward and downward spike are created in the response on either side of resonance.
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I think your choice of a coupling factor of 0.9 isn't very realistic and if you go for the ideal factor of 1 that issue goes away. You also need to include the coil resistances and adding 200 ohms to each coil in addition to making the coupling factor 0.99 has things appearing much better. The sim now behaves much more closely to what happens in the real world.
dave
I never use 1.0 coupling, but you're correct about the coil resistance. I was in a hurry and forgot. Even only 200 ohms in each winding is sufficient to smooth it out, and raising the source R to 600 ohms further flattens the plot. My mistake, thanks for the correction. My earlier plot and comments directly above should be totally ignored.
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Buy Chinese. Bury freedom.
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