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Old 27th August 2012, 12:50 AM   #2781
shaan is offline shaan  India
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Quote:
Originally Posted by maxlorenz View Post
Dear Shaan,

Since "we" have a nice PCB now, could you point us to your variation of the SSA.
Now I can't find it.

Many thanks,
M.
Here you go.

LINK -> Simple Symetrical Amplifier
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Old 27th August 2012, 03:59 AM   #2782
naf is offline naf  Indonesia
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Originally Posted by alex mm View Post
..... PCB for Shaan's schematic was done this weekend as naf asked
Regards Alex.
whooa... thank you very much sir! ...
Sir, would you upload bottom pattern and top component layout for toner transfer.. please.

regards,
naf

Last edited by naf; 27th August 2012 at 04:09 AM.
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Old 27th August 2012, 04:44 AM   #2783
alex mm is online now alex mm  Europe
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.... thanks all for kidnes and suggestion
Regards Alex.
Attached Files
File Type: pdf PCB BOTTOM TOP VIEW.pdf (108.9 KB, 200 views)
File Type: pdf PCB TOP ALL.pdf (97.3 KB, 190 views)
File Type: pdf PCB TOP SILK MIRROR.pdf (132.8 KB, 158 views)

Last edited by alex mm; 27th August 2012 at 04:48 AM.
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Old 27th August 2012, 05:19 AM   #2784
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Originally Posted by caglarm View Post
Its my Nico Ras version..
Of course mosfets under the PCB
Very nice and small. Well done!
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Old 27th August 2012, 06:16 AM   #2785
naf is offline naf  Indonesia
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Originally Posted by alex mm View Post
.... thanks all for kidnes and suggestion
Regards Alex.
wow! you're very fast sir... thank you
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Old 27th August 2012, 11:08 AM   #2786
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Quote:
Originally Posted by Esperado View Post
Are-you living in the same world than us ?
Probably not, not only am I a investor and part owner of a couple of companies in the commercial sector in audio business but I also have access to design principles through association. Just look at past 12 years of Nad, 98 % have been CFB, a prominent german PA company practically only use CFB ( the design is 99 % like this presented by lazycat except it is from 1994 and thermal issues revolved), all Cyrus amps since III are CFB, Pioneer, Accuphase, so many german and swiss High end amps, 90 % marantz models since 2004, the list just goes on and on.

You dont have the info to make the statement you did on the % of CFB amps Im afraid. Maybe you could ask member Jacco here at DIYaudio, hell have a much better idea than yourself as he follows the audio world pretty closely.
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Old 27th August 2012, 11:51 AM   #2787
AndrewT is online now AndrewT  Scotland
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are all these CFB amplifiers inverting?
Do some, or all, have an inverting stage on the input to bring the output phase back in line with the input?
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Old 27th August 2012, 11:51 AM   #2788
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Quote:
Originally Posted by shaan View Post
Here you go.

LINK -> Simple Symetrical Amplifier
Thank you dear Shaan, but the link bites its tail and returns the same page

M.
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Old 27th August 2012, 12:26 PM   #2789
mikelm is offline mikelm  England
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Quote:
Originally Posted by AndrewT View Post
Home,
are all these CFB amplifiers inverting?
Do some, or all, have an inverting stage on the input to bring the output phase back in line with the input?
I would guess nearly all are non inverting

1st stage will be inverting as usual - out of phase

2nd stage non inverting as usual - back in phase again

an inverting design would have a very low i/p impedance typically 50 - 100R
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Old 27th August 2012, 01:40 PM   #2790
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Andrew, Mike is right. There are three CFB amps I can recall now that used inverting second stage and so the feedback is taken back to input node and not the emitters of input pair which is probably what you meant with your question. Two were designed by Stan Curtiss and the other is german by Audiolabor.
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