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-   -   EI or double-C core for class A Amp? (http://www.diyaudio.com/forums/power-supplies/221051-ei-double-c-core-class-amp.html)

jeepy 6th October 2012 04:54 PM

EI or double-C core for class A Amp?
 
Hi All,
I asked some companies for custom transformers and the price for double -C is significantly higher compared to EI core even if they are a bit smaller in size. Is there any benefit using the more expensive ones for class A amplifiers? I am assuming that unlike for class AB amps, the current trough the windings is almost constant. On top of that, the Pi filter CRC or ClC 0.2 to 0.4F total capacitance. I do not want use toroids for this application and I can't have custom R-core ¨made for my application.
Thanks.

jcx 6th October 2012 05:55 PM

for a capacitor input supply the mains transformer current is narrow spikes at the rectified line V peaks, many times the average load current to recharge the caps

a large choke can smooth the peak transformer current - but typically has to be similar physical size to the transformer to store enough energy in its mag field


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