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Old 22nd October 2005, 10:54 AM   #1
Pasul is offline Pasul  Czech Republic
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Default All fet super buffer

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

Buffer working good,but DC stability isnīt 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,
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Old 22nd October 2005, 01:05 PM   #2
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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...
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Old 22nd October 2005, 02:14 PM   #3
Pasul is offline Pasul  Czech Republic
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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!
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Old 7th December 2008, 03:27 AM   #4
lineup is offline lineup  Sweden
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i think you will get better dc-stability
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Old 7th December 2008, 05:25 AM   #5
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Servo would be better.
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Old 12th November 2012, 04:57 AM   #6
MINER is offline MINER  Serbia
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Does anyone has schematics for this preamp???
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