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Old 1st August 2008, 10:58 AM   #11
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Hi Jan!
Thank you for evaluating my amp.
I'm sorry that saying the thanks slows!!!!!.
Thanks very very much!

Sincerely
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Old 2nd August 2008, 01:24 PM   #12
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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
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Old 2nd August 2008, 05:56 PM   #13
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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
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Old 2nd August 2008, 06:38 PM   #14
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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.
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Old 2nd August 2008, 11:30 PM   #15
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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(0.033F) connected in parallel 8 ohm resister.

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

This part was translated with above-mentioned URL.


Sincerely
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Old 3rd August 2008, 12:05 AM   #16
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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
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Old 4th August 2008, 02:07 AM   #17
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Ok, interesting.

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

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Old 4th August 2008, 11:17 AM   #18
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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
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Old 15th September 2008, 04:30 PM   #19
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Default small refine

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
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File Type: jpg amp_44_1.jpg (91.2 KB, 1139 views)
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Old 15th September 2008, 09:52 PM   #20
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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?
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