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Re: Care to elaborate?

Are you talking about the primary and secondary?

Yes.

In the transformer, the primary and secondary are complimentary (I say complimentary due to Lenz's Law) locked together in a 100% magnetic feedback loop. In the Sziklai, the two elements are locked together in a 100% electric feedback loop.

And for a Sziklai pair made of bipolar devices, just like a transformer, has no inherent impedance but rather reflects impedances, i.e. the load impedance is reflected back to the input/primary and the source impedance is reflected into the output/secondary.

In a transformer, the impedances are reflected based on the square of the turns ratio. In a bipolar Sziklai pair, the impedances are reflected based on the product of the betas of the two devices.

I came to using the bipolar Sziklai pair when on something of a whim, decided to design a little amplifier based on a number of elements taken from eastern philosophy a la Nelson's "Zen" series amplifiers and that included the balancing of complimentary elements (i.e. yin and yang) among others.

The single-ended active bipolar Sziklai pair current amplifier made for an excellent compliment to the balanced passive voltage amplifier, not to mention the compliments within each element.

Here's the result I came up with in the end:



The "47" is both a bit of a reference to 47 Labs ("Only the simplest can accommodate the most complex") and to the fact that it does about 4 watts using 7 parts. :)

se




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