In May 2005 (118th AES Convention), I described a self compensated transformer for Single ended Audio amplifiers, designed as SC-OPT and based on the principle that an auxiliary winding (tertiary) crossed by the same current as the primary, opposes a magnetic flux that reduces the overall flux, produced by the DC, to almost zero. In this paper, an extension is discussed where no external adjustment is needed to balance the DC flux inside the core to zero. The new transformer is fully self-auto balancing.
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