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Old 17th September 2010, 05:06 PM   #1
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Default A new power Amp with K2220 / J351

Hi All

I have made a new amplifier.
So far, plus the following additional content to Prior art that expand the control error.

1.To extract the distortion, it splits into two signals. and, either is for DC servo, the other is Characteristically for distortion feedback.

Frequency characteristics,
When 8.2ohm load (1W) :350KHz.
When 2.2ohm load (3.6W) :200KHz.

Regards
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Old 17th September 2010, 05:09 PM   #2
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Default The circuit and photo

HI All
I UPLOAD the circuit and Photo again.

Regarads
Attached Images
File Type: gif Amp_Mk3.GIF (43.6 KB, 295 views)
File Type: gif MK3_setumei_en.GIF (8.6 KB, 280 views)
File Type: jpg New develop_AMP_MK3.JPG (83.9 KB, 282 views)
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Old 17th September 2010, 06:17 PM   #3
EUVL is offline EUVL  Europe
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Very interesting devices.
What makes you choose them (instead of say 2SK1058, 2SK1529, etc.) ?

Any idea where to get some at reasonable price ?
(Anything I can find is over 600 Yen a piece.)


Thx,
Patrick
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Old 17th September 2010, 06:28 PM   #4
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Nice project, but only 2 output TR-s,& too meny others!

What about otputput power?

Regards
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Old 18th September 2010, 12:29 AM   #5
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Default Hi ! EUVL

Hi ! EUVL
Thank you for your reply.

2SK2221/2SJ352 or 2SK2220/2SJ351 is an updated version of 2SK1058.
Reference URL is put on the following.(Sorry most part is written Japanese)
"http://homepage2.nifty.com/~mhitaste/audiotop/dcamp_parts/dc_ampparts015.html"

I have willingly used 2SK3497/2SJ618 and 2SK1529/2SJ200 that Gm is large up to now.
Reference URL is put on the following.
AMP Mk2_v2

And, they were used without the source resistance. The reason is that it was felt that it still influenced tone quality.

Then, K2220/J351 that the temperature property is negative was adopted. However, because Gm was small, feedback was devised.

Regards
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Old 18th September 2010, 12:49 AM   #6
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Default Hi ! zeonrider

Quote:
Originally Posted by zeonrider View Post
Nice project, but only 2 output TR-s,& too meny others!

What about otputput power?

Regards
Hi ! zeonrider
Thank you for your reply.

Yes , I think too many parts,too.
It is because there is a purpose of the experiment as the hobby of the electric circuit, too. (I like experiment.....http://www.diyaudio.com/forums/images/smilies/wink.gif)

It is assumed 60W or less based on the radiator and the maximum rating of the electrolysis capacitor obtained easily now.

In the characteristic, the gain hardly falls also on the load 2.2Ω by 20KHz. Therefore, it is expected that a large speaker can be driven enough.


Regards

P.S
This amp page is following (sorry only written with Japanese)
AMP MK3
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Old 21st September 2010, 04:24 PM   #7
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Default Measurement result postscript

Hi

Measurement result ,postscript

THD+N : 1KHz Less than 0.02% (Measuring limit of my equipment)
http://www2.plala.or.jp/puthoff/phot...MK3_hizumi.GIF
DF :360
(I think largeness in single PP of MOS FET. )


Regards
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Old 13th May 2011, 06:09 PM   #8
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Default A NEW STUDY

Dear ALL

I study a new one .
It's only simulation yet, now making PCB.

data
gain 33.4dB
-3dB 440KHz

8ohm 1W,
THD 0.000001

but only Simulation, it may be oscillation

Regards
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File Type: jpg MK3_L_c.JPG (166.1 KB, 108 views)
File Type: jpg MK3_L1.JPG (79.9 KB, 100 views)
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