Dx Super A - MKII - The most awesome audio amplifier i have ever made

destroyer x

Compulsive builder
Dx Corporation, the Union of the best wide world audiophiles, reserve to itself the right to change schematics and circuits in order to make them even better following the stream of evolution of science and technology and our own evolution as human beings.

The good amplifier of today may be a junk tomorrow due to the evolution.

if you do not listen two amplifiers from my line to compare, you will never know that and you can be happy with the old and good Dx amplifier...this old fellow sounds great..but if you listen the Dx Super A together in a comparison, you hold the sledge hammer and will make the Dx amplifier in pieces.

Here you have a sample..observe this is recorded with a cheap digital camera...in a on acoustic environment, i have used matresses, pillows and all stuff to control reflections...i have reduce microphone sensitivity, the power output was 500 miliwatts and the speakers is junk from Chinese Sony products.... but even this way...increase you volume knob...cranck the guy all the way up and feel the emotions.

You already has something in the Dx Blame thread..now i will feed this one.[video=youtube;X88G02PSp7A]http://www.youtube.com/watch?v=X88G02PSp7A[/video]

digital camera has a noise that i have removed with a digital processing..only the noise..but sound is not compressed, nor equalized, not adjusted.

regards,

Carlos
 

destroyer x

Compulsive builder
You can have almost all informs about in my Youtube channel, there are a lot of movies talking about this amplifier.... my youtube channel adress is in the signature line below our post... in red.

Here you have schematic.

regards,

Carlos[URL=http://imageshack.us/photo/my-images/171/schematicb.jpg/][IMG]http://img171.imageshack.us/img171/8626/schematicb.jpg[/URL] Uploaded with ImageShack.us[/IMG]
 

destroyer x

Compulsive builder
A video that exposes if 1 watt of audio is good or not (RMS)... that discusses Classes of amplifier and speakers is being uploaded...here you have the link, it gonna be available in one hour more (uploading and long)

http://youtu.be/qYtpGbiMkV

regards,

Carlos
 

destroyer x

Compulsive builder
It is now even better... i have made modifications that reduced even more the harmful third harmonic...now it is almost nothing or half of anything.

Sound is playing right now and it is awesome..from heaven![URL=http://imageshack.us/photo/my-images/94/modstoreduceevenmorethi.jpg/][IMG]http://img94.imageshack.us/img94/4053/modstoreduceevenmorethi.jpg[/URL] Uploaded with ImageShack.us[/IMG]

regards,

Carlos
 

destroyer x

Compulsive builder
I have adjusted the stand by current to 300 mA yesterday....now, after 24 hours playing... current is 270mA

It was dissipating a little bit more than 20 watts.

You see down the wall's corner a circuit...this is a zener (2V7), a resistor (22 ohms) and a red Led...it starts to light at 1.2 Watts...... these parts are in series and they are connected in parallel with the speaker wires..... i have adjusted to avoid it to light.

regards,

Carlos[URL=http://imageshack.us/photo/my-images/259/24hoursplaying1wattoutp.jpg/][IMG]http://img259.imageshack.us/img259/5350/24hoursplaying1wattoutp.jpg[/URL] Uploaded with ImageShack.us[/IMG]
 

destroyer x

Compulsive builder
Two guys are producing pcboard layout...one is Juan Vargas from Porto Rico and

the other one is Zimmer, from Brazil.

Zimmer may finish first because he is using a more clever way to do..he is starting from something already made by Mitchel....so, just making the small modifications.

Juan is starting from zero!...well..this takes much time... in this video he is showing us his progress 14 days after he started.

regards,

Carlos
[video=youtube;wkZgExvHvJU]http://www.youtube.com/watch?v=wkZgExvHvJU[/video]
 

destroyer x

Compulsive builder
Video evaluating Juan Vargas work about the layout design

It is approved, almost final layout.

regards,

Carlos[video=youtube;5OJiae8sfIs]http://www.youtube.com/watch?v=5OJiae8sfIs[/video]
 

destroyer x

Compulsive builder
These may be final instructions to Juan about the pcboard layout....he is making

progress.

Juan will not produce pcboards to sell in group buys or out of group buys..but i have another friend, from Brazil, the name is Zimmer, that is making another layout based into the Dx Blame ST green boards, and he may offer to the whole world.

Of course and naturally i will offer to several foruns, the images needed to home etching of this amplifier.

regards,

Carlos[video=youtube;lq5AxNlS_iQ]http://www.youtube.com/watch?v=lq5AxNlS_iQ[/video]
 

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destroyer x

Compulsive builder
Is really this Dx Super A much better than the Dx Blame ST?

Watch this video please... in two languages, Portuguese and English.

regards,

Carlos[video=youtube;K7p8w-heXh8]http://www.youtube.com/watch?v=K7p8w-heXh8[/video]
 

destroyer x

Compulsive builder
Juan has made the layout

I am very sorry, audio in english was missed.... software "eated" or has supressed the first minute were i had english text...but you can see video...the pcboard layout is video.

regards,

Carlos[video=youtube;x2Q9XQZU4wI]http://www.youtube.com/watch?v=x2Q9XQZU4wI[/video]
 

destroyer x

Compulsive builder
My home Dx Super A will operate out of the Class A feature as i have no good heatsink

regards,

Carlos[video=youtube;RhF9YsUXJyM]http://www.youtube.com/watch?v=RhF9YsUXJyM[/video]
 

destroyer x

Compulsive builder
Very good... Juan made it correct size to use the "L" shape adaptors sold in the

Brazilian forum... was 400 units of "L" adaptors that must now fit our needs for them to upgrade their amplifiers to this new model.

regards,

Carlos[video=youtube;TqHqNJ20-Xo]http://www.youtube.com/watch?v=TqHqNJ20-Xo&feature=youtu.be[/video]
 

destroyer x

Compulsive builder
Simulator results can be a HOAX, depending the way you use them

And i was using wrong way...one more think i have learned and sharing with you in two languages.

regards,

Carlos[video=youtube;yoNI5HeIhkM]http://www.youtube.com/watch?v=yoNI5HeIhkM[/video]
 

destroyer x

Compulsive builder
Please, remove this electrolitic condenser

current.

This bothers a lot when we go adjusting as capacitors opposes to voltage variations, it charges and discharges and disturb a lot.

Remove it or install a 100n in place as low values will not bother and will procceed the suck out action too.

regards,

Carlos
 

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destroyer x

Compulsive builder
Dx Super A is flat...say...it is electricaly flat...but something exist, the sonic

signature..something that is different in all amplifiers.

Yes, it is...but when you connect to speaker it does not look flat anymore...the sonic signature appears.

It looks that has a gain above 10 kilohertz, and it is not a small gain, in a graphic equalizer it is alike to increase 6 dB all frequencies above 10 kilohertz.

What gonna happens?

People not that skilled will say it has lack of bass...negative!..bass is there, and very powerfull, and moving the speaker and pumping huge ammounts of air, but the high end treble looks so strong that we feel the amplifier has not bass...in the reality, when connected to speakers, it reproduces treble very well an this looks, by comparison that we have no bass.

This is a matter of our reference point.... we can say has not bass or we can say has a lot of treble... depends on your mind precision.

regards,

Carlos
 

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destroyer x

Compulsive builder
Hey Sami!...here you have rithm from your place...the drums at 01:32

My daugther is in the telephone in the back ground... a teenager.

regards,

Carlos[video=youtube;2LvjAba3BZo]http://www.youtube.com/watch?v=2LvjAba3BZo[/video]
 

destroyer x

Compulsive builder
I am preparing a supply to further testing in deep class A testings

regards,

Carlos[video=youtube;tYCrWBDQMl8]http://www.youtube.com/watch?v=tYCrWBDQMl8[/video]
 
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