FirstWatt J2 - Page 57

audiodesign · 02:43 PM

I have seen now the schematic on forum pag. 49

There is a current locker so these mosfet are not like lateral

Zen Mod · 14th January 2011, 02:45 PM

I see 29 pages - that's browser/user dependable

be more specific - which post exactly

bobodioulasso · 14th January 2011, 02:56 PM

This one?
FirstWatt J2

Quote:

There is a current locker so these mosfet are not like lateral

Not mosfets but power Jfets

flg · 14th January 2011, 05:16 PM

What is a "Current Locker"?

These SiC JFETs are lower threshold like Laterals though. And that seems to be an issue with the output biasing that is not quite typical Pass? Even the 1.25V version of TL431 might not cut it? Or maybe no one makes it anymore???

flg · 14th January 2011, 05:23 PM

O.K. Page 50 explains a little more. A TL Reg may work but Papa says it is less stable or "would need adj..."

"Current Locker" you mean the over current protection Q1?

Zen Mod · 14th January 2011, 05:27 PM

I=2A

40C : Ugs=1V576
70C : Ugs=1V581

TempCo

flg · 14th January 2011, 05:56 PM

.16mV/C

Are you kidding? Is that in the data sheet?

Zen Mod · 14th January 2011, 06:03 PM

let's say just that Mighty ZM measured that

not thoroughly with CCS biasing , but with plain power resistor between PSU and drain

gate was tied to drain , of course

in any case - let them bleed ......... and do not worry too much

audiodesign · 14th January 2011, 06:08 PM

this

Zen Mod · 14th January 2011, 06:10 PM

what with this ?

that's plain CCS .

rephrase question , so we can answer

14th January 2011, 02:30 PM	#561
audiodesign diyAudio Member Join Date: Sep 2005	I have seen now the schematic on forum pag. 49 There is a current locker so these mosfet are not like lateral Last edited by audiodesign; 14th January 2011 at 02:43 PM.

14th January 2011, 02:45 PM	#562
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	I see 29 pages - that's browser/user dependable be more specific - which post exactly __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

14th January 2011, 05:16 PM	#564
flg diyAudio Member Join Date: Jul 2005 Location: North East	What is a "Current Locker"? These SiC JFETs are lower threshold like Laterals though. And that seems to be an issue with the output biasing that is not quite typical Pass? Even the 1.25V version of TL431 might not cut it? Or maybe no one makes it anymore??? __________________ “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

14th January 2011, 05:23 PM	#565
flg diyAudio Member Join Date: Jul 2005 Location: North East	O.K. Page 50 explains a little more. A TL Reg may work but Papa says it is less stable or "would need adj..." "Current Locker" you mean the over current protection Q1? __________________ “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

14th January 2011, 05:27 PM	#566
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	I=2A 40C : Ugs=1V576 70C : Ugs=1V581 TempCo __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

14th January 2011, 05:56 PM	#567
flg diyAudio Member Join Date: Jul 2005 Location: North East	.16mV/C Are you kidding? Is that in the data sheet? __________________ “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

14th January 2011, 06:03 PM	#568
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	let's say just that Mighty ZM measured that not thoroughly with CCS biasing , but with plain power resistor between PSU and drain gate was tied to drain , of course in any case - let them bleed ......... and do not worry too much __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

14th January 2011, 06:10 PM	#570
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	what with this ? that's plain CCS . rephrase question , so we can answer __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
An another way to Firstwatt F1?	Idefixes	Pass Labs	5	1st February 2012 08:40 PM
Subwoofer and Firstwatt F1	tgrauss	Subwoofers	10	3rd June 2009 04:29 PM
Fostex and Firstwatt in car?	Ipanema	Car Audio	2	11th February 2008 05:32 AM
FirstWatt.com	Rory Christ	Pass Labs	121	31st May 2004 07:02 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read