More power from JFET
The Lovoltech JFET device does not have a P-channel counterpart, so a N/P push-pull output stage is out of the question.
A quasi-complementary version should in theory at least, be possible with the N-channel.
To me it seems much of the idea behind the F3 and the ZV9 is to operate the JFET at a special part of its transfer curve, that is, where it resembles a triode.
My question is then, a quasi-complemantary amplifier with the JFET might "spoil" this concept, and there might be any reason for it left. Maybe even not a N/P-complementary amplifier with an imaginary P-channel JFET would give the F3 sound?
Any comments from preferably the Zen-master himself? ;-)
Regds
Rolv-Karsten
The Lovoltech JFET device does not have a P-channel counterpart, so a N/P push-pull output stage is out of the question.
A quasi-complementary version should in theory at least, be possible with the N-channel.
To me it seems much of the idea behind the F3 and the ZV9 is to operate the JFET at a special part of its transfer curve, that is, where it resembles a triode.
My question is then, a quasi-complemantary amplifier with the JFET might "spoil" this concept, and there might be any reason for it left. Maybe even not a N/P-complementary amplifier with an imaginary P-channel JFET would give the F3 sound?
Any comments from preferably the Zen-master himself? ;-)
Regds
Rolv-Karsten
Re: More power from JFET
I think you are completely misunderstanding the working conditions of ZV9.
1. It is a Single-Ended output, not Push-Pull.
2. Complementary devices are not required.
3. The JFET and the output MOSFET is in cascode configuration.
4. The JFET is biased to provide a slightly concave transfer curve to compensate the convex transfer curve of the output MOSFET to reduce distortion.
May be you need to read the ZV9 documents for details.
R-K Rønningstad said:The Lovoltech JFET device does not have a P-channel counterpart, so a N/P push-pull output stage is out of the question.
A quasi-complementary version should in theory at least, be possible with the N-channel.
To me it seems much of the idea behind the F3 and the ZV9 is to operate the JFET at a special part of its transfer curve, that is, where it resembles a triode.
My question is then, a quasi-complemantary amplifier with the JFET might "spoil" this concept, and there might be any reason for it left. Maybe even not a N/P-complementary amplifier with an imaginary P-channel JFET would give the F3 sound?
Any comments from preferably the Zen-master himself? ;-)
Regds
Rolv-Karsten
I think you are completely misunderstanding the working conditions of ZV9.
1. It is a Single-Ended output, not Push-Pull.
2. Complementary devices are not required.
3. The JFET and the output MOSFET is in cascode configuration.
4. The JFET is biased to provide a slightly concave transfer curve to compensate the convex transfer curve of the output MOSFET to reduce distortion.
May be you need to read the ZV9 documents for details.
h_a said:
Anyway I added you to the list, just let me know if I got you wrong.
Is there an update on the status of this group buy?
Will you send me a PM when the group buy starts? I ask this because I don't follow the activity forum every day....
Thanks,
Luis
luis.martins said:
Is there an update on the status of this group buy?
Will you send me a PM when the group buy starts? I ask this because I don't follow the activity forum every day....
Thanks,
Luis
See this for the latest update:
http://www.diyaudio.com/forums/showthread.php?postid=1257002#post1257002
Subscribe that thread to get notified of any new posting.
Links Gone
All the links are gone. Does anyone have copy of them?This is printed board for Zv9 that we designed with Peter Daniel. There is all You need do make this DIY way
An externally hosted image should be here but it was not working when we last tested it.
schematic diagram
PCB view
bottom
bottom - mirrored
Great thanks to Mr Pass for sharing this project!
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