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Old 13th September 2012, 09:39 AM   #1131
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
I have the schematic.
Thanks Joachim it is different than the one I found.
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Old 13th September 2012, 09:53 AM   #1132
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What do you think Frans : is R33 = 8 Ohm ?
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Old 13th September 2012, 09:57 AM   #1133
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Quote:
Originally Posted by Joachim Gerhard View Post
What do you think Frans : is R33 = 8 Ohm ?

Yes, in both schema's, and that seems a bit(under statement) low (for the bias adjustment).

The mosfet in use http://pdf1.alldatasheet.com/datashe...HI/2SK135.html has gate protection build in, so why bother with external protection.

Also, I see (now) that the gate-source cutoff voltage at 100mA and Vds 10V is 0.15 to 1.45 Volt that may just be fine with the 8 Ohm bias regulator.

(I think this is edit 10 )

Last edited by FdW; 13th September 2012 at 10:11 AM.
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Old 13th September 2012, 10:20 AM   #1134
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Quote:
Originally Posted by AndrewT View Post
Give as a link to the schematic/s.
Add that link and your descriptive comment to post1.
SSA BIGBT HP link.

Link also added to post #1 in SSA thread.
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Old 13th September 2012, 02:58 PM   #1135
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Quote:
Originally Posted by Lazy Cat View Post
SSA BIGBT HP link.
L.C, On my computer, both links are broken: they point to a fake post number, then, goes to page 61, depending if you read the thread in reverse or normal order.
A working one ?
Simple Symetrical Amplifier

About thus adjustable resistance on my schematic, it is a value for sim.. I will have a look of the value of my adjustable in real world as soon i get some time and courage..
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Last edited by Esperado; 13th September 2012 at 03:26 PM.
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Old 13th September 2012, 03:50 PM   #1136
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Quote:
Originally Posted by Joachim Gerhard View Post
Christophe, i have checked your schematic.
Is R33, the bias resistor, really 8 Ohm ?
I wrote already about it. Look here Simple Symetrical Amplifier
dado
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Old 13th September 2012, 03:57 PM   #1137
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Original schematic of the Crescendo found here:
http://www.solaris.no/electronics/po...cresc_1280.gif
Value of the adjustable was 250 Ohms (unchanged -if i remember well- on my modified board.)
In the simul, value of the resistance was tuned for 150Ma of quiescent current in each Power mosfet.

Again, this mod was just for demonstration of CFB versus VFB.
I had tuned my board in real world in a first time, then closed the box with no notes.
Few weeks later, made and publish the simul as i was delighted by the improvement . Not sure the simul reflect the exact value of my real amp.
Unless you have yet a Crescendo at home, i will not recommand to build it, on many aspects, SSA BIGBT HP will be far superior.

As i said in the SSA thread there is no place, in the SSA BIGBT HP where i can feel like the slightest desire to change anything :-)
Driver is just top of the art.
And the Current Source is a pure perfection.
So, i understand why L.C. was upset reading "best T/SSA in the next few years is none of the circuits available today on this thread" ... after all this masterpiece work.

But L;C. is a cheater, using BIGBT, and we where discussing (in a general way) about using lateral Mosfets for power units, and i suppose Jay had not seen the HP version.
So, please, Jay, don't take the L.C. words too badly. You where not so wrong, after all, because SSA BIGBT HP was not in this TSSA thread :-)

The problem is those two separated huge threads, and the poor search tool of the forum.
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Last edited by Esperado; 13th September 2012 at 04:05 PM.
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Old 14th September 2012, 04:06 AM   #1138
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Originally Posted by Esperado View Post
As i said in the SSA thread there is no place, in the SSA BIGBT HP where i can feel like the slightest desire to change anything :-)
...But the power supply.
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Old 14th September 2012, 09:15 AM   #1139
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We agree on that
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Old 14th September 2012, 09:49 AM   #1140
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. . . and I think my new supply will be a mix of chokes & cap multiplier
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