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Old 20th April 2012, 10:39 AM   #971
generg is offline generg  Germany
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Hi Protos,

Yes simple schematics will come, I have to cook now for my nice wife!
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Old 21st April 2012, 07:30 AM   #972
generg is offline generg  Germany
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I hope this "handmade" picture helps...

I hope there are no faults, I am in a hurry to go to a party in Heidelberg.....46 years Abitur celebration......two days....

see you later on monday...
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Old 23rd April 2012, 02:19 PM   #973
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At the moment I would say that the CCS solution, especially the solution B with the Semisouth described in Mikes CCS.pdf,
I missed it, where can I find that .pdf?

Roscoe, who's currently recovering from a badly broken wrist, so building is on hold for a while
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Old 23rd April 2012, 02:38 PM   #974
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I missed it, where can I find that .pdf?

Roscoe, who's currently recovering from a badly broken wrist, so building is on hold for a while
Ouch...hope you have a speedy recovery.

The pdf is on Michael's site:

http://rothacher.typepad.com/files/lampccs.pdf
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Old 23rd April 2012, 02:39 PM   #975
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Sorry to hear that man. Breaking any bone is bad, but I imagine breaking a wrist is pretty nasty with all the bone involved there in.
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Old 23rd April 2012, 04:21 PM   #976
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Thanks for the .pdf link and the thoughts. Guess I'll be stuck listening to my F2J clone for a while
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Old 23rd April 2012, 04:33 PM   #977
Zen Mod is offline Zen Mod  Serbia
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Roscoe

heal fast ........
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Old 23rd April 2012, 06:26 PM   #978
protos is offline protos  Greece
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Originally Posted by generg View Post
I hope this "handmade" picture helps...

I hope there are no faults, I am in a hurry to go to a party in Heidelberg.....46 years Abitur celebration......two days....

see you later on monday...
I do not see how this works honestly.
Maybe I am misinterpreting something but the way I understand it your gate has to biased NEGATIVE to your source whatever that voltage is and not negative to ground. So if your source is sitting on eg -35v negative rail then the gate should be MORE NEGATIVE than -35 maybe like -38V.
The way you are deriving your bias at the gate is from a resistor network from ground to neg rail which is going to give you a value between the neg rail and ground so that will be more positive than your source.

If you are going to use the neg rail either it should be for biasing the gate with the source sitting at 0V otherwise connect the gate to the neg rail and use source degeneration to lift the source above the gate.
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Old 23rd April 2012, 06:46 PM   #979
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Originally Posted by protos View Post
I do not see how this works honestly.
Maybe I am misinterpreting something but the way I understand it your gate has to biased NEGATIVE to your source whatever that voltage is and not negative to ground. So if your source is sitting on eg -35v negative rail then the gate should be MORE NEGATIVE than -35 maybe like -38V.
The way you are deriving your bias at the gate is from a resistor network from ground to neg rail which is going to give you a value between the neg rail and ground so that will be more positive than your source.

If you are going to use the neg rail either it should be for biasing the gate with the source sitting at 0V otherwise connect the gate to the neg rail and use source degeneration to lift the source above the gate.
Look at it again. - reference isn't at ground, it's at 4Rx1.6A, or 6.4V above ground.

Roscoe
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Old 23rd April 2012, 07:00 PM   #980
generg is offline generg  Germany
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thanks Roscoe! I am smelling the smoke of 2,6A at the moment!

Protos it works...... at the moment in my amp.....maybe as always..... my ugly handmade pictures irritate you.


but again, best definition and low level detail is by Mikes first resistor solution!

most body and bass by the Hammond choke, but less definition...

between the chairs are the CCS solutions and Mu-solutions..... in my eyes

it depends what you want and how the rest of your system harmonizes with the different possibilities.....
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Last edited by generg; 23rd April 2012 at 07:03 PM.
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