Amplitude modulation converts to FM modulation in a 90 degree phase shift environment. You can conceive it either way. Look at Barrie Gilbert's analysis.
Federmann have functional amp with " lazy " darlingtons such as TIP142/147 or similar, which he recommend to his customer ( and which we can to see at his pages )...isn't surprise, that he have problems with transistor sound...and his new one, amazing mosfet amp, isn't able to get into functional operation still more than one half of year...Isn't it true, Federmann ?
Rotation of the output signal is Vdif magnification. Here you can see the progress of the output signal. Can count THD flow period. Period is short, fast audio portion.
More charts here
Federman,
What do you exactly mean with these curves? In the bottom curve I see some 3rd harmonic, which is in phase with the original tone. Is there more to this?
jd
Maybe the guys here are not familiar yet what means the ****. Would you kindly elaborate a bit on this topic?
That's why I am saying it is nothing but a non-linearity, Jan. No mysterious phase shift influence. The only phase shift influence might be that the 3rd appears visually near the zero-crossing or near top, depending on phase angle of the 3rd vs. fundamental.
Thanks for your input, I really do need some qualified support here.
Blue - Vdif
Green - the size of the current collector transistor
Red - green derivative (to highlight errors)
i m just reading in his site, and to his credit, he says that it s
useless to use fast devices that must be bandwith limited with
capacitive compensations...
wahab, please check this thread (no sample built, source resistors etc.):
http://www.diyaudio.com/forums/soli...n-hqqf-55-a.html?highlight=topology+federmann
http://www.diyaudio.com/forums/soli...n-hqqf-55-a.html?highlight=topology+federmann
Federmann, this is a beginner's amplifier, but it is designed to sound good. This is because the feedback is minimum, the GBW is maximum, and the open loop bandwidth is high.
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