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Old 5th October 2011, 10:49 AM   #1051
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I totally agree with Mr. Nico about good analogue sound

Last edited by Smiley 09; 5th October 2011 at 10:51 AM. Reason: change the lenght
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Old 5th October 2011, 04:27 PM   #1052
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Quote:
Originally Posted by Lazy Cat View Post
Look at this, maybe you'll like it even more.
So Crescendo is an amp with the right topology to be easily upgraded to SSA, which opens quite a lot of possibilities for the owners to make a sonical upgrade to their long term companion.
There is only one design situation where your SSA or current feedback cannot be implanted in an existing amp: Where first stage is not symmetrical and has his emitter with a DC offset. But it is not a sSa by nature ;-)
I would like we discuss about the issue with your low values resistances for feedback i encounter in my sims, described in my thread. Can be a global issue ?
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Old 5th October 2011, 07:04 PM   #1053
FdW is offline FdW  Netherlands
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Default What am I missing?

This is the version that I plan to build, but the fact that the bias current highly depends on the load impedance makes me doubt. Why is this (the varying bias), and can I improve/correct this?

The versions I build will or will not have the CFP’s, I will try them both.

The IRF’s are at a slightly elevated bias, this is to isolate them from the varying IB’s of the power transistors (the simulator tells me that it improves (marginally) by upping the IRF’s bias).

As you can see I am planning to build a power supply that delivers 4 voltages (+/- 40V and +/-15V).

Regards,
Frans.

SSA BIG4BT by FdW.JPG
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Old 5th October 2011, 10:34 PM   #1054
alex mm is online now alex mm  Europe
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Default PCB for SSA LOW IMP HP

...... new PCB for SSA LOW IMPEDANCE HP .....
Alex.
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Old 6th October 2011, 12:55 AM   #1055
a.wayne is offline a.wayne  United States
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Alex deh One ...... ....
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Old 6th October 2011, 01:35 AM   #1056
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Quote:
Originally Posted by alex mm View Post
...... new PCB for SSA LOW IMPEDANCE HP .....
Alex.
Very very beautifull.
Just my two cents: Why don't use 10X1000µF instead of those huge 10 000 ? It feat better on board (size and height). it is easier to find. It gives better values (average), it is less expensive, and most of all, each one will have lower ESR & ESL, that will be divided by... 10 !
The only annoyance is, all the 15/20years, you'll have to change 20 caps instead of 2 ;-)
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Old 6th October 2011, 02:37 AM   #1057
a.wayne is offline a.wayne  United States
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presumably , the 10x10,000 is in the psu .......knowing Alex,he is just getting started .....

Last edited by a.wayne; 6th October 2011 at 02:42 AM.
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Old 6th October 2011, 02:43 AM   #1058
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Thumbs up ALEX . . . PURE BEAUTY of an ART

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Originally Posted by alex mm View Post
...... new PCB for SSA LOW IMPEDANCE HP .....
Alex.
Alex, You become a master of this art, this one is as beauty as it can be, & the only cousin missing here is the balanced one and the family will be complete . . . . . .
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Old 6th October 2011, 03:57 AM   #1059
suresh is offline suresh  India
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Quote:
Originally Posted by Nico Ras View Post
Fluid, very transparent, accurate, but not hard on the ears or cynical. In short well behaved music listeners amp
Thanks for your feedback . let me know the important thing's like which transistor pairs should be matched . hfe important or Vbe matchig or both ? what is the output bias current settings and output offset voltge limit.
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Old 6th October 2011, 08:03 AM   #1060
AndrewT is offline AndrewT  Scotland
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Originally Posted by FdW View Post
This is the version that I plan to build,
the OUT location is wrong. You show it from the top end of L1.
It should be OUT at the top of R27/bottom of L1
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