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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 22nd September 2016, 02:07 AM   #701
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
RCruz, I just noticed you didn't use the TL431... I guess I'm just reading my own experience over again!
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Old 22nd September 2016, 10:38 PM   #702
BenY is offline BenY
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Quote:
Originally Posted by keantoken View Post
R9 is the DC trim. You may be sending ~1uA of DC through your cart (if I assume correctly that is what you're doing). Either that or your BC560 has ~250Hfe. Or possibly it is running at double it's intended current (could happen if you don't use Fairchild transistors). To adjust R9 all you need is a DMM.
Why is it recommended to use the Fairchild transistors? What is wrong with the ON Semi ones?
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Old 22nd September 2016, 11:30 PM   #703
keantoken is online now keantoken  United States
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They are out of production for one. Also the Vbe is different, so they require some adjustments. In listening tests the Fairchild transistors seemed to work better.
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Old 24th September 2016, 05:51 PM   #704
RCruz is offline RCruz  Switzerland
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The Kuartlotron - keantoken's simple error-correction superbuffer
Quote:
Originally Posted by Destroyer OS. View Post
RCruz, I just noticed you didn't use the TL431... I guess I'm just reading my own experience over again!
Will do soon
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Old 25th September 2016, 12:05 PM   #705
nikosokey is offline nikosokey  Greece
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Here is my buffer from Keantoken the board is from Project16
I use unmatched ON Semi transistors , my offset is 0.1-0.2 mv.
i put total 3,7ΜΩ resistors for R12 .
i use 10uf cap before the buffer and 10ΚΩ and 50ΚΩ pot.Super quiet...
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Last edited by nikosokey; 25th September 2016 at 12:32 PM.
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Old 25th September 2016, 12:35 PM   #706
Project16 is offline Project16  France
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Hello nikosokey

It is a pleasure to see that my route was served, the only small problem is that the four capacitors of this circuit are small beings.

Achieving your copper engraving is perfect!

Regard's
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Old 25th September 2016, 12:45 PM   #707
nikosokey is offline nikosokey  Greece
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Many thanks Project16 for all...
BR Nikos
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Old 25th September 2016, 12:48 PM   #708
nikosokey is offline nikosokey  Greece
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Quote:
Originally Posted by keantoken View Post
They are out of production for one. Also the Vbe is different, so they require some adjustments. In listening tests the Fairchild transistors seemed to work better.
Hi Keantoken
I use ON Semi
I need to make changes for better results?
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Old 25th September 2016, 01:19 PM   #709
Project16 is offline Project16  France
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Quote:
Originally Posted by nikosokey View Post
Hi Keantoken
I use ON Semi
I need to make changes for better results?
I do not know if with Fairchild is better but I use CDIL and listening is very good.
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Old 25th September 2016, 07:14 PM   #710
nikosokey is offline nikosokey  Greece
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Measures after trimming for dc offset=0.1mv-0.3mv +/-
Vbe Q4=672mv, Q2=670mv Q3=618mv Q1=615mv
on R2=56Ω=51.2mv
on R12=150Ω parallel to trim 100Ω=51.3mv
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