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In Reply to: RE: more on output impedance posted by cpotl on January 17, 2015 at 05:15:27:
Thus in this case of an idealised output device, for which all conventional ways of calculating the output impedance will give the answer Zout = R, your way of defining the output impedance will give the answer Zout = 0.17 R, which is about one sixth of the correct answer.
In practice this is not borne out. I stated earlier what the differences are. However I should point out that its also impractical to assume that we are going for a perfect voltage source. In fact we are not, in our case we are going more for a power source. All amplifiers were power sources in the old days- SETs still are, as are many tube amps without loop feedback.
Obviously a perfect voltage source will have infinate power at zero ohms. It does not exist.
Its a different way of looking at it. What I recommend is that you play with the equipment and take measurements as they will reveal more than the math seen so far. Or you could trust that the numbers I suggest are right- I've done these measurements many times. Did you read the article at the link? There is a reason why someone would want to design an amplifier that has a higher output impedance like this- oddly, its because you can get less coloration- quite the opposite of the 'accepted wisdom'. This is because of how the human brain processes sound, which ultimately is the final arbiter.
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Follow Ups
- There's gotta be a bug somewhere - Ralph 10:05:05 01/19/15 (2)
- RE: There's gotta be a bug somewhere - cpotl 05:33:40 01/21/15 (1)
- Sounds/looks like we are on the same page here - Ralph 08:28:21 01/21/15 (0)
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