Valery, thank you for checking an idea.
Very good results!
Cascoded one needs a cascoded current source for keeping overall concept and idea!
😉
Something like this:
With high enough caps it will also provide nice soft-start with intrinsic noise filtering.
Diamondstark PA1
OK, here is my simulation with OPS, utilizing one of the known local error correction techniques. Most of the distortion is coming from OPS anyway, however it looks pretty good even close to clipping (100W @ 8 ohm).
I will simulate a few other OPS options and then - live testing will show if the thing is worth all the work done so far 🙄
OK, here is my simulation with OPS, utilizing one of the known local error correction techniques. Most of the distortion is coming from OPS anyway, however it looks pretty good even close to clipping (100W @ 8 ohm).
I will simulate a few other OPS options and then - live testing will show if the thing is worth all the work done so far 🙄
Attachments
Simplestark
Finally - not as sophisticated and accurate as the previous one, but a rather simple one and still promising in terms of the way it's going to sound.
Self-biasing IPS, trimmers for OPS offset and bias settings.
Finally - not as sophisticated and accurate as the previous one, but a rather simple one and still promising in terms of the way it's going to sound.
Self-biasing IPS, trimmers for OPS offset and bias settings.
Attachments
The distortion specs are 1 or 2 decimal places off what you normally design, but I'm curious what these will sound like!
Yes, numbers are not as good, but still decent for no global loop architecture.
I'm trying to find the way to listen to it... still looking for space for the lab 🙄
I'm trying to find the way to listen to it... still looking for space for the lab 🙄
Vz, are you aware of Arto Kolinummi's work on a complete non-global fb amplifier as described in his book?
Jan
Jan
Just a little help with PCB . I hope no errors . Maybe someone want to try ....🙂
Attachments
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Valery,
I really like your amp, and now that Alex MM has done a Tintoretto on your Simplestark, it could become a masterpiece, like the JLH........
Mind you, 12 semis, but very innovative and very good figures for a ZFB amp!
Поздравляем с прибавлением!
Hugh
I really like your amp, and now that Alex MM has done a Tintoretto on your Simplestark, it could become a masterpiece, like the JLH........
Mind you, 12 semis, but very innovative and very good figures for a ZFB amp!
Поздравляем с прибавлением!
Hugh
Jan, thank you for the link - right to the point.
I have ordered the book.
Cheers,
Valery
Hi Alex, thanks a lot for this piece of art - great work, as usual
Would you mind to share the gerbers or whatever interchange format, suitable for ordering the boards (this one will go for no-profit DIY purposes only)?
My building abilities are temporary limited, but I will find the way to prototype and test this one 😎
Cheers,
Valery
Hi Hugh,
Thank you, good to see you here.
Yes - a great gift from Alex, inspiring for moving the project forward 🙂
Highly linear ZFB solutions attract my interest - I believe, it's always better to avoid "errors" wherever possible, in the first hand, than to correct them afterwards, one way or the other.
Looking forward to building a prototype - let's see the live performance 😉
Cheers,
Valery
Pdf or jpg also appreciated😉Hi Alex, thanks a lot for this piece of art - great work, as usual
Would you mind to share the gerbers or whatever interchange format, suitable for ordering the boards (this one will go for no-profit DIY purposes only)?
My building abilities are temporary limited, but I will find the way to prototype and test this one 😎
Cheers,
Valery
Files in .pdf format attached 🙂 .I use .rar format and forum not allowed to use it. Gerbers will be send by email . 😱
Regards,
Alex
Regards,
Alex
Maybe i could try it but those 2sk170,j74
See schematic , use 2SK246 and 2SJ103 .......thanks for comments 🙂
Are you open for modifying layout?
Output inductor directed to the IPS - very bad.
High-current OPS placed inline - bad.
High-current supply inputs provide huge loop - moderate.
Far distance to decoupling caps - moderate.
High-current paths near IPS - bad.
High-current loop around IPS - very bad.
Thimios, I've got some of those in stock - just need to reach my external warehouse - I will arrange a few pairs for you via post 😉
Is there anything else you're short of for building a pair of those? I will review my stock a bit broader then.
Ask him for matched pairs of 2SK163/2SJ44:
Original NEC NOS 2SK163L unmatched 50 pcs Genuine parts guaranteed | eBay
I've buyed over 50 pairs with very good +-0,1 mA matching.