Thanks to keantoken for pointing me to this thread.
There is a notch filter in the setup I used to create that FFT, which attenuates the fundamental by 30dB, so the harmonics should be read directly from the scale, not compared to the fundamental.
Have already finished the HECshunt PCB , and done some preliminar test´s.
The power supply is stable, no signs of oscillation.
Very low noise floor. And very hight PSRR.
The output impedance is 30uR at 150 Hz, 60uR at 1Khz and 600uR at 18Khz.
I think the impedance increase at higher frequencies is caused mainly by the skin effect of the cooper wire, that connects to the load. I will have to use a better setup in the next test´s that I will do (perhaps use litz wire). nonetheless I am very pleased with the results .
It measure 75mm by 50mm
The power supply is stable, no signs of oscillation.
Very low noise floor. And very hight PSRR.
The output impedance is 30uR at 150 Hz, 60uR at 1Khz and 600uR at 18Khz.
I think the impedance increase at higher frequencies is caused mainly by the skin effect of the cooper wire, that connects to the load. I will have to use a better setup in the next test´s that I will do (perhaps use litz wire). nonetheless I am very pleased with the results .
It measure 75mm by 50mm
Attachments
Maybe, if you use BC337-40 and yours happen to have the same Vbe as mine. They should have roughly 60mV +-5mV more Vbe than the BC550C. If it's less than that, the world won't end, but you'll get more than 20mV offset.
For use as the output buffer based on these schematics, yes:
http://www.diyaudio.com/forums/analogue-source/218625-paradise-builders.html#post3189527
Turn-on behavior should be verified to be benign.
http://www.diyaudio.com/forums/analogue-source/218625-paradise-builders.html#post3189527
Turn-on behavior should be verified to be benign.
As I expected, Elvee has done similar things and provided me with some links:
http://www.diyaudio.com/forums/solid-state/184895-halve-diamond-double-performance.html
http://www.diyaudio.com/forums/solid-state/185501-unigabuf-follower-cut-out-leader.html
http://www.diyaudio.com/forums/solid-state/218019-distortion-cancelling-buffer.html
I haven't seen anyone else with my specific implementation, but there are many different versions and most of them perform excellently.
The philosophy with my version was to get the best inherent null possible. In effect, using equivalent devices to cancel so that the 3rd and higher harmonics would cancel just as well as the 2nd. Theoretically, this should be the most benign for audio assuming all other critical factors were taken care of.
http://www.diyaudio.com/forums/solid-state/184895-halve-diamond-double-performance.html
http://www.diyaudio.com/forums/solid-state/185501-unigabuf-follower-cut-out-leader.html
http://www.diyaudio.com/forums/solid-state/218019-distortion-cancelling-buffer.html
I haven't seen anyone else with my specific implementation, but there are many different versions and most of them perform excellently.
The philosophy with my version was to get the best inherent null possible. In effect, using equivalent devices to cancel so that the 3rd and higher harmonics would cancel just as well as the 2nd. Theoretically, this should be the most benign for audio assuming all other critical factors were taken care of.
Can this (http://www.diyaudio.com/forums/analogue-source/154210-mpp-927.html#post3554680) be built using a non simetric psu ex: +20V - 0V ?
