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Old 6th November 2012, 09:34 PM   #681
dsdjoy is offline dsdjoy  Germany
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Still working on J2, feeling more dumb every day, I decided to start writing my experiences down....
More to come....some chapters are still waiting for less dumb persons than me to be filled...

book.jpg
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Old 6th November 2012, 09:55 PM   #682
Zen Mod is offline Zen Mod  Serbia
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grünschnabel !

you're only at 4-th edition !

mine is at least 224-th , still not final

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Old 6th November 2012, 10:09 PM   #683
labjr is offline labjr  United States
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No official circuit for the J2 yet?
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Old 6th November 2012, 10:22 PM   #684
Zen Mod is offline Zen Mod  Serbia
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nope
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Old 6th November 2012, 11:07 PM   #685
dsdjoy is offline dsdjoy  Germany
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Quote:
Originally Posted by Zen Mod View Post
grünschnabel !

Exactly ! Still wet behind the ears

As you are on your 224th Edition, I'd be happy to cite you in the Chapter: Dirty tricks - How to get 2nd harmonic to 0.023% and 3rd harmonic to 0,004% by using artistically, carefully unmatched semisouth or ZenMods famous ZenPot

With CCS at 20mA and some semisouth source-resistor tweaking the 2nd and 3rd harmonics looked fine, when getting back to 10mA CCS the values are far too low and the amp sounds too thin and uninvolving.

I need some help... easy instructions....for dummies like me.....

Last edited by dsdjoy; 6th November 2012 at 11:11 PM.
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Old 6th November 2012, 11:24 PM   #686
Zen Mod is offline Zen Mod  Serbia
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or just fold input LTP (inner drain) to lower SJEP source



it's easy - you just need original one ( which you have ) , few basic instruments for testing each part's static characteristics , and good THD meter

or - even simpler - you need better spks , so every amp will work just good

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Old 7th November 2012, 01:26 AM   #687
ANADIGIT is offline ANADIGIT  Europe
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He he

Everything is secret !
The future still dark but not for me :-)
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Old 7th November 2012, 01:17 PM   #688
generg is offline generg  Germany
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the problem is not as easy...

my friend dsdjoy succeeded in cloning the THD spectra 98%, even Nelson got a nice picture of the similar spectra of clone and original and accepted that dsdjoy had done a good job.

But the original still sounds better...... !

and the master is laughing......or..... or....
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Old 7th November 2012, 01:33 PM   #689
Zen Mod is offline Zen Mod  Serbia
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if you boys got it 98% of THD spectra , rest is in your head

I had short circ between two headphones too many times , so I know how's that

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Old 7th November 2012, 01:42 PM   #690
vdi_nenna is offline vdi_nenna  United States
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Quote:
But the original still sounds better...... !
Could it be some other part you are overlooking that is effecting the sound of your J2?
Maybe it was some other choice in part(s) and not your circuit design that's having, to your ears, a negative effect or less than perfect result.

What about polarity at the speakers? What about break-in time? What about grounding scheme? Power supply? etc, etc.

Maybe you are dead on target, but just overlooking one small piece. Just a thought.
Hope you find the missing piece. Really do!

Vince
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