FirstWatt J2 - Page 48

Zen Mod · 22nd February 2010, 02:10 PM

Quote:

Originally Posted by woody

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 .

lae2 · 22nd February 2010, 04:13 PM

ZV8 grapples with the LU1014 and power dissipation.

http://www.passdiy.com/pdf/ZV8_power_jfet.pdf

flg · 22nd February 2010, 05:55 PM

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?

Zen Mod · 22nd February 2010, 06:14 PM

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

SisterOfMercy · 10th April 2010, 09:35 PM

Quote:

Originally Posted by Jon Ver Halen

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.

Quote:

Originally Posted by Samuel Jayaraj

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

Quote:

Originally Posted by flg

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.

flg · 11th April 2010, 01:19 PM

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

ak4396 · 3rd May 2010, 12:55 PM

Hi, what do you think?

The right way?

Zen Mod · 3rd May 2010, 01:20 PM

nope

ak4396 · 3rd May 2010, 01:59 PM

The right direction?

eyoung · 3rd May 2010, 02:08 PM

Please forgive my intrusion but, is the pc817d a bias generator??? or am i looking at this all wrong....

Elwood

22nd February 2010, 05:55 PM	#473
flg diyAudio Member Join Date: Jul 2005 Location: North East	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? __________________ “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” Dr. Seuss

22nd February 2010, 06:14 PM	#474
Zen Mod Official Court Jester diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	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 __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery

11th April 2010, 01:19 PM	#476
flg diyAudio Member Join Date: Jul 2005 Location: North East	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 __________________ “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” Dr. Seuss

3rd May 2010, 01:20 PM	#478
Zen Mod Official Court Jester diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	nope __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery

3rd May 2010, 02:08 PM	#480
eyoung diyAudio Member Join Date: Aug 2007 Location: Sunny SC,USA 15 min south of Charlotte NC	Please forgive my intrusion but, is the pc817d a bias generator??? or am i looking at this all wrong.... Elwood __________________ "when you open your mind to the imposible, soon you will find the truth...."


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22nd February 2010, 04:13 PM	#472
lae2 diyAudio Member Join Date: Jan 2010 Location: Hershey, PA	ZV8 grapples with the LU1014 and power dissipation. http://www.passdiy.com/pdf/ZV8_power_jfet.pdf

3rd May 2010, 01:59 PM	#479
ak4396 diyAudio Member Join Date: Feb 2008	The right direction?

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