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Old 22nd February 2010, 01:10 PM   #471
Zen Mod is offline Zen Mod  Serbia
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Originally Posted by woody View Post
Looking at the simplified schematic of the J2 ....
somewhere in Aleph J thread you can see some good (Papa's and Patrick's ) thoughts about implementing LU in that concept . there you can also see my usual "dumb ZM" contribution

besides that - in same thread you can find plenty tips regarding Uds and Iq for LU , to keep it in sweet triode region

F3 pdf is certainly informative , too .
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Old 22nd February 2010, 03:13 PM   #472
lae2 is offline lae2  United States
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ZV8 grapples with the LU1014 and power dissipation.

http://www.passdiy.com/pdf/ZV8_power_jfet.pdf
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Old 22nd February 2010, 04:55 PM   #473
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ZM, might you be thinking about the DAO or headphone amp threads? Whatever, there is some good info from Patrick on the LU device but finding it all might be tedious...
However, my own thumbnail suggestion would be, a 1-1.2 ohm Rsource for the LU and 1/2 that value for the 2 Rs in the middle... Just my 2cents worth. running non cascode you would likely want to keep the power on the LU <10W and maybe paralell a couple?
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Old 22nd February 2010, 05:14 PM   #474
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I'll stick with F3 conditions ( Iq, Rs , Uds ) for power amp

same as for cascode ; torturing it with more volts isn't dissipation , but load-line issue
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Old 10th April 2010, 08:35 PM   #475
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Quote:
Originally Posted by Jon Ver Halen View Post
I am beginning to understand your problem. That was a bottle of single malt whiskey in the bathroom, not kool-aid.
Well, whisky is always better than kool-aid mixed by Jim Jones.

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Originally Posted by Samuel Jayaraj View Post
Nelson, hats off to you. You are a wizard. Thanks a ton.
I want to see pictures of that, NP in a wizard robe. Should look good

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Originally Posted by flg View Post
Using water however dictates your temp regulation at 100C (212F)
Why? Not if it's a closed system, I think. The pressure is not constant.

I used to think amplifiers were made out of a lot of parts, and a huge PCB. I guess NP proves that it doesn't have to be like that.
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Old 11th April 2010, 12:19 PM   #476
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SisterOfMercy, I was refering to use of the nucleate boiling technique some pages ago. Which I described as an open system taking advantage of the water boiling point to regulate temp. System open or closed, 100C die is however a sane max temp for reliability sake. I would still be sceptical of the apparent "boiling noise" I spoke about.
Typical closed systems such as CPU and Video card coolers can do a good job and mantain lower temps easily enough
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Old 3rd May 2010, 11:55 AM   #477
ak4396 is offline ak4396  Germany
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Hi, what do you think?

The right way?
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Old 3rd May 2010, 12:20 PM   #478
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nope
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Old 3rd May 2010, 12:59 PM   #479
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The right direction?
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Old 3rd May 2010, 01:08 PM   #480
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Please forgive my intrusion but, is the pc817d a bias generator??? or am i looking at this all wrong....

Elwood
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