Intro a circuit of study..

[turnA_zpoint]

Hi Jan!
Thank you for evaluating my amp.
I'm sorry that saying the thanks slows!!!!!.
Thanks very very much!

Sincerely

[turnA_zpoint]

Hi
For Study Research material.
I think it is very interesting.

ODNF (Only Distortion Negative Feedback Luxman)
this study is
http://www.ne.jp/asahi/evo/amp/odnf/odnf.htm

D-NFB
this study is
http://www.ne.jp/asahi/evo/amp/Dnfb/consider.htm http://www.ne.jp/asahi/evo/amp/Dnfb/sakadati.htm

Sincerely

[bear]

Did a Google Translate of your amp page.

Unsure what I am seeing in the square wave images?
Input clean - output ringing w/capacitive load??

Is that capacitor w/no resistor?

Somewhat concerned about stability with the ringing shown?

Regards,

_-_-bear

[fredlock]

Hi TurnA,

What is the wattage of this Amp? Is it compatible with 4 or 2 ohms load? Very interesting amplifier. Sorry for the stupid questions.

[turnA_zpoint]

Hi Bear !
thanks !�@
(I'm grad translation goes well)

(1)About capacitive load ,with or without,
the square wave images , the below of
http://www2.plala.or.jp/puthoff/amp5.html
, I explain.

(upperutput 1V/div,lower: input 50mV/div)

1. The Left and right (bouth)�@:Without capacitive load ,only 8 ohm resister.
The left : Input frequency is 1MHz
The right : Input frequency is 100KHz

2. The Left : without capacitive load ,only 8 ohm resister .
The right: with capacitive load(0.033ƒÊF) connected in parallel 8 ohm resister.

3. The Left : with capacitive load(0.1ƒÊF) connected in parallel 8 ohm resister.
The right: with capacitive load(1.0ƒÊF) connected in parallel 8 ohm resister.

This part was translated with above-mentioned URL.


Sincerely

[turnA_zpoint]

Hi fredlock !
Thanks Reply!

It's important .
I tried with 4 ohms load (resister),but not tried with 2 ohms.

Speaker is in transitionaly change its impedance, so, under the present situation, can not drive the 2 ohms speaker, may be.

If you increase the number of output stage FET (and some treatments ,source register,gate resister..,driver transistor etc), may be able to drive 2ohms. However, it is a guess because it doesn't actually try sorry...


Sincerely

[bear]

Ok, interesting.

Think you want to change the word "amends" to "compensation".
If I get the meaning correctly, that is the proper english word.

_-_-bear

[turnA_zpoint]

Hi bear !

Very thank you the correcting my mistakes,the "amends" to "compensation" !
I corrected the text of the explanation.

About the response of capacitive load, when decreasing the frequency response to about 300KHz , in the appearance, it is improved.(But I don't chose......)

Thanks

Sincerely

[turnA_zpoint]

Hi !
I make miner refine of the circuit.
1.Active LPF is through a part of pulse wave,so add LPF .
2.Change the supply of the driver Tr line.

result: though only my impression, that became openhearted tone quality.

Sincerely

[fredlock]

Hi TurnA,

Good job! How many watts this amplifier again? Do you have a PCB layout that you can share? What do you meant by openhearted tone quality? Is it like the tube amps? warm sounding amp?