A new power Amp with K2220 / J351

[turnA_zpoint]

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

 

[turnA_zpoint]

The circuit and photo

HI All
I UPLOAD the circuit and Photo again.

Regarads

 

[EUVL]

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

 

[stoN_Cold]

Nice project, but only 2 output TR-s,& too meny others!

What about otputput power?

Regards

 

[turnA_zpoint]

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

 

[turnA_zpoint]

Hi ! zeonrider

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

 

[turnA_zpoint]

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/photo_mk3/MK3_hizumi.GIF
DF :360
(I think largeness in single PP of MOS FET. )


Regards

 

[turnA_zpoint]

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