Anyone have made those diy discretes op-amps ?

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Illusus

Illusus

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Joined 2002
I have some Nelson Pass( if I remember correctly) designed op-amps I bought with an active XO (MOX) kit. I had some extras and used them to replace the 5532s in my NAD 1240, the discrete op-amps took that preamp to much higher level than any AD or BB product I tried beforehand.

I think I may have some extra boards/parts left over, I'll look for them if you're interested.
 
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gaetan8888

Member
Joined 2007
Illusus said:
I have some Nelson Pass( if I remember correctly) designed op-amps I bought with an active XO (MOX) kit. I had some extras and used them to replace the 5532s in my NAD 1240, the discrete op-amps took that preamp to much higher level than any AD or BB product I tried beforehand.

I think I may have some extra boards/parts left over, I'll look for them if you're interested.
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Hello

Nelson Pass do excellent circuits design, but finding fet transistors (like 2SK170 and 2SJ74) here arround was not possible, so I never try them.

Do you have the schematic of your discrete op-amps ?

Thank

Bye

Gaetan
 
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syn08

syn08

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Joined 2005
synaesthesia.ca
Samuel is the guy mantaining an amazing document about current opamps performances (IC and discretes) http://www.sg-acoustics.ch/analogue_audio/ic_opamps/pdf/opamp_distortion.pdf

The latest versions of the document include a self evaluation of his discrete designs (if you ask me, very fair and objective). Do the reading, compare with the other options/designs and then make an educated decision.
 
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gaetan8888

Member
Joined 2007
syn08 said:
Samuel is the guy mantaining an amazing document about current opamps performances (IC and discretes) http://www.sg-acoustics.ch/analogue_audio/ic_opamps/pdf/opamp_distortion.pdf

The latest versions of the document include a self evaluation of his discrete designs (if you ask me, very fair and objective). Do the reading, compare with the other options/designs and then make an educated decision.
Click to expand...

Hello

I have read this very good document, interesting but measurements will not allway tell about sonics qualities.

Btw, the author, Samuel Groner, discuss about his documents and works in this thread;

OpAmp Measurement Series


Thank

Bye

Gaetan
 
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tiefbassuebertr

tiefbassuebertr

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Joined 2005
tiefbassuebertragung.de
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