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Phase splitter with caps.
The "Cathodyne", or concertina, phase splitter seems to be a perennial
source of interest. I looked up a couple of long threads that appeared on this newsgroup in 1999 and 2001. I also did a google search and found postings on various forums. There has been confusion about how it works for some time, and explanations have been published (e.g., www.aikenamps.com/cathodyne.pdf) since the early days of vacuum tube audio. Eminent persons have thought first one way, and then the other. Henry Pasternack in one of those long threads asked: "How can it be that the outputs of the split-load phase splitter have different impedances, yet the signal amplitudes track one another as the load resistances vary equally?" I haven't been able to find a truly detailed analysis, so I decided to do one myself. I hope I have made it clear and persuasive enough to clear up some of the confusion. I posted an analysis with only DC conditions a couple of days ago. I have now done another analysis with capacitive loading applied to the outputs. The results are in 4 .gif files. The first shows the method of analysis, and the next 3 show some results with different capacitive loadings. The image files have been posted in alt.binaries.schematics.electronic and in alt.binaries.pictures.radio. |
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