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Old 17th February 2007, 12:06 PM   #81
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Hi Carlos !
Nice to see your amps growing!

Also your attempt to get the brain free with a pretty women is quite promising. Amps only is killing creative minds. ...but... aren't you married?
Take care or

Back to topic:
Your approach to skip the emitter resistors:
Which type of resistors did you use, when u noticed the negative influence? Wire wound? Did you also compare with low inductive types?
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Old 17th February 2007, 12:25 PM   #82
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Default The mind if free to apreciate the young girl beauty...of course i cannot advance

I am happy to met you here Choco...a very good old friend...i have your images in front of that German lake..near the mountains. It is very good watching you in another stage of your life...not so happy, as culture may be enormous problem...you may feel very lonely...for sure.

One of the ideas, about Dx amp, is to make something cheap.... the resistors easy to find in brazil (for future kit's production) are those wire wound ones...but they have six turns only...this is very small to disturb too much...was more punch in the bass what i have perceived clearly..without doubts....i have installed them once more and i perceived..also the meters turns slow (analog and digital AC voltimeters connected to output during musical reproduction....i have removed them finally, my conclusion is that they may be interesting as protection, as power equalizers when many output pairs is beeing used...but in this Ximple amplifier...negative...they were banished out of this amp.

Those non inductive beauties are expensive, and to produce here, the amplifier will have to be sold withing a competitive cost range compared to LM3775...if not, no way to convince Brazilians...no way.... my people may be not very well instructed with good schools, but they are clever....more clever than needed...and this sometimes create problems.

As exist some ideas to future business with this schematic, it have to use cheap dirty transistors, cheap parts, minimized parts quantity (more parts will be removed soon...regenerative may fly out!)..only those parts that affect clearly the sonics will be keept there...for instance...feedback capacitor is needed...Miller not needed....regenerative maybe not needed.... big condenser not needed for sure (with good supplies..but for kits...hummm...470uf may be needed..at least this small ones)

Sounded good Chocoholic...so good as Choco design i have made many monthes ago.

Life is good those days....and i am feeling better as you are here, in this thread, with me now....interesting how internet can create confidence and friendship connections.

I will take my Airplane to the frontier...extreme Northwest of Amazon... to testimony deviation of gas lines that are happening there if informs are correct..i will have to write some papers to Federal Government that are waiting those informs.
regards,

Carlos
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Old 17th February 2007, 12:44 PM   #83
lineup is offline lineup  Sweden
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hi

As I told, in post above ....
I would set up my version of Dx-Amp and do some tests.

***********************************************

This is the 'Greg Erskine' very nice schematic I used for my set up.
dxamp - greg version from 2007-02-14
http://www.diyaudio.com/forums/attac...amp=1171455661

My first testing of this amp have my small modifications ( already mentioned above),
and using other, but similar transistors ( some told by Carlos as good alternatives ).
I have also told, I have not all transistor types in my sim software.
I also used 'only' 2x30 V DC supply.
I do not need more power than this.
I would think Transformer: 2x22VAC, 200-300 VA .... for each channel
*********************************************

Results:
Very good!
* Upper frequency limit is ~200kHz
* THD distortion is very low. ( I must say I was a bit surprised )
* Fourier Analysis spectrum is also showing some nice things.


I will keep my version, for myself.
I would recommend anyone DIY, to try your own version of this Amplifier.
You may be Pleasantly Surprised!
This is definitely a good audio amplifier, in my opinion.


Regards, lineup
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Old 17th February 2007, 03:13 PM   #84
tinitus is offline tinitus  Europe
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Aha! I can see you recommend MJL15004...

I have a bunch of very nice sounding MJL21193/21194 with outputboards in need of a input/driver board

I will run them at +/- 50-55V

any problem with this
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Old 17th February 2007, 09:36 PM   #85
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Default Artistic image of Dx amplifier, pretty work made by Greg Erskine


A very good friend, that is cooperating, producing schematics and layouts...also Mr. Sparkle cooperated with schematics.

Thank you both...very kind from U2

regards,

Carlos
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Old 17th February 2007, 09:37 PM   #86
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Default I am also producing some Artistic board with real parts over it.


To show the amplifier, in a more real manner...but for sure will not be so pretty as Greg's work.

The full throttle thread has many images from the earlier models...called Ximple and Simplício..you can see test circuits there...made to listen...not to a beauty competition.

regards,

Carlos
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Old 18th February 2007, 12:01 AM   #87
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... now we are all getting crazy about professional PCBs, - right?
I got infected end of last year.
Now you..
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Old 18th February 2007, 06:46 AM   #88
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Default I really think that those things are really foolishes.

Also i think that we are not professionals, we are hobbie guys and we do not need those things....to compete with professionals....waste fo time!...no money will enter to compensate your effort and you will have only the possibility to open the amplifier case to show the unit to your near friends.

Your friends may think that you made enormous effort to convince them that you are a professional..when you are not...ahahahaha.

A little bit ridiculous in my point of view...but there are hundreds that apreciate those things...they use to say that if you have to do something do it perfect.... they are programmed alike computers, they cannot think about the time losses because of that and many consequences that will produce inside friends mind..some ideas this behavior may produce can be not so nice..

At least he will not be considered a "pig" alike i am....ahahahahha.

If you search for "full throotle construction of amplifiers ", you will see that i do not bother with those things...i love to make them fast to listen them as soon as possible and finishing to construct another one...and another one...and once more..and repeat all that maniac behavior in the next week, month and year...... i am also fanatic and sick alike many folks...i am not exception....i am crazy inside my own way.

This is something i asked Greg Erskine, my dear friend, as i want to have people constructing, and i have failed related that as i am very bad to make Propaganda about my own things....the pretty board is to atract people to construct.

I am also constructing a pretty circuit, in the real world, to show how pretty this construction can be ...a non working circuit with pretty coloured parts only...as mine working things are ugly and do not make a nice presentation of the product.

I want to give a chance to myself to show some ideas to forum friends, and also to give them a chance to realise some ideas.

That "simple amplifiers can sound so good, or even better than sophisticated designs"...but i think people do not want to face this reality...that's what i am starting to believe, to conclude.

PCboard was made...copper lines layout, professional schematic provided, general informations offered, the chance to the one make his own version was offered too...but no one had intentions to construct till today...let's see the future.

When the first one construct and evaluate positive... a boom of guys will go to do also....this is a normal "mechanic" of human behavior.

Be sure, dear Choco, that all this is an effort to create some interest..pretty things are always well accepted..ugly things makes people think about ugly sound...ahahahaha...people is wonderfull!

Send me all ugly girls to scratch my back....to swim with me in my swiming pool and to watch television with me...i love ugly girls, they are in bigger quantity than the pretty ones..also the pretty ones are too much hunted.

BTW dear Chocoholic, tell us something about your adventure in Hong Kong.

You made me feel so idiotic doing professional boards...hehe..you cannot believe the effect on me...alike a punch on my chin, almost a knock out!...but i know your intentions were not that one...my own personal beliefs produced that punch into myself..relax man...i still apreciate you very much...you are not a standard German....much more kind than many others.

regards,

Carlos
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Old 18th February 2007, 07:12 AM   #89
lineup is offline lineup  Sweden
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You made me feel so idiotic doing professional boards...
hehe..
you cannot believe the effect on me...
alike a punch on my chin, almost a knock out!



Yeah,
destroyer X
You are now a professional!
So what are you doing here at the hobby diy audio forum???


Not only there are people doing better PCB here.
There are also people trying to improve performance of circuits.

Let's remember one thing:
That not to fool ourselves
Saying we are amateurs
while trying to be professional
in our audio works


DIY Audio people, the real ones
should have audio circuits and audio things
that are like 50% good only.



Thanks to ChocoHolic!
You did save one guy here, from turning bad
and going ProAudio.
It would have been a sad things for all of us
to miss him.


Regards
lineup
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Old 18th February 2007, 08:41 AM   #90
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Default Re: I really think that those things are really foolishes.

Quote:
Originally posted by destroyer X


BTW dear Chocoholic, tell us something about your adventure in Hong Kong.



regards,

Carlos
Hong Kong?
Hong Kong would be much more my taste. But I am in Guangzhou. 3h far from Hong Kong. We only go to Hong Kong for some party week ends once and while. But you can also party in GZ area, believe me. Unfortunately most people here do not speak english, that's a little bit a fun killer.
Anyway ...visited Peking for a few days... Forbidden City, Great Wall etc.... impressive!
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