All fet super buffer

Pasul · 22nd October 2005, 10:54 AM

Hi all,
I have problem with this construction:
http://www.borbelyaudio.com/pics/EB-602-403%20final.pdf

Buffer working good,but DC stability isn´t very well!When I switch on at out is 240mV and going down to 0V.After two minute stable on 3-25mV.Still going up and down.I did two this buffer ,and doing this both of them.

excuse my english,

regards,

Upupa Epops · 22nd October 2005, 01:05 PM

Help is easy : 'cos EB like to listen DC signal

, all his connections are DC coupled...If you make feedback loop not as " DC " and connect R 7 through some larger capacitor ( elyt + foil in parallel ), problems will be away....Second solution is to get this buffer into thermoisolated box with regulated constant temperature...

Pasul · 22nd October 2005, 02:14 PM

Hi Mr.PD,
when I construct All fet line amp ,there is not problem with DC.But there is DC servo.In super buffer I make feedback loop.Gain 6dB.I put this Buffer in TopDAC.

I go try to put there capacitor.

Thanks for help

P.S.Second help looks fine!

lineup · 7th December 2008, 03:27 AM

i think you will get better dc-stability

john curl · 7th December 2008, 05:25 AM

Servo would be better.

MINER · 12th November 2012, 04:57 AM

Does anyone has schematics for this preamp???

7th December 2008, 03:27 AM	#4
lineup diyAudio Member Join Date: Dec 2005 Location: the north	i think you will get better dc-stability __________________ lineup

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
audio nirvana super 10 or super 12	tonytex	Full Range	11	4th September 2011 10:55 PM
Nirvana super 8 and cast super 8 how do they compare to 206E?	freddi	Full Range	4	22nd October 2010 02:29 AM
Diamond Buffer - Super Buffer	peranders	Solid State	34	16th May 2010 01:46 PM
FS: SUPER CD PRO KIT with SUPER SHOCKPROOF	bbp	Swap Meet	5	17th April 2009 05:09 AM
Opamp + buffer, how to bypass buffer at HF for unity gain?	Christer	Solid State	10	29th October 2003 06:50 AM

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


	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

22nd October 2005, 01:05 PM	#2
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Help is easy : 'cos EB like to listen DC signal , all his connections are DC coupled...If you make feedback loop not as " DC " and connect R 7 through some larger capacitor ( elyt + foil in parallel ), problems will be away....Second solution is to get this buffer into thermoisolated box with regulated constant temperature...

22nd October 2005, 02:14 PM	#3
Pasul diyAudio Member Join Date: Dec 2004 Location: Czech	Hi Mr.PD, when I construct All fet line amp ,there is not problem with DC.But there is DC servo.In super buffer I make feedback loop.Gain 6dB.I put this Buffer in TopDAC. I go try to put there capacitor. Thanks for help P.S.Second help looks fine!

7th December 2008, 05:25 AM	#5
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Servo would be better.

12th November 2012, 04:57 AM	#6
MINER diyAudio Member Join Date: Oct 2012 Location: Beograd	Does anyone has schematics for this preamp???