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Old 3rd November 2012, 02:47 AM   #111
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Default The top ones are not used in this amplifier prototype

they are just there because this heatsink is used in several other projects, so, transistors almost "belong" to the heatsink..... i am running it at 42 volts, 8 and 4 ohms only and one pair in the output.

Supply is using 10.000 plus 10.000uf and transformer is 330 watts.

This amplifier will have two output pairs.... Juan is preparing the pcboard layout, when ready i will publish in this thread.

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 3rd November 2012, 03:57 AM   #112
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Wow, very clever Carlos! Thanks for sharing your designs with us. We all love this hobby...That is why we are all here!
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Old 3rd November 2012, 10:27 AM   #113
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Default I do love to help.... ask all you want...if i know i will answer

if i do not know i will try to research to answer...if negative i will tell you.

I am someone that has a lot of practice...i am not addicted and i do not know too much theories..but something i can say.

I am working in the diySMPS forum, also into the Brazilian "Eletronica Silveira" that can speak spanish without troubles there too..also if enter in English i can help translating there..these are the main ones...but i am really dedicated to audio amplifier tweaking and the production of videos about...i have a channel in Youtube (hehehehe... everybody has)...type Carlos Mergulhão and 500 videos will be there if you want to see some about audio.

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 3rd November 2012 at 10:30 AM.
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Old 3rd November 2012, 01:52 PM   #114
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Default I was received alike a kind in my new Brazilian forum...missed only

The Military band of Music for celebration and the "keys from the town"..but i was invited, in a very respectfull and educated way, to subscribe to their forum...then i am there, gladly.

So different if i compare with the HT forum where they banished me three times, where i have to ask please to enter to explain things about my amplifiers that someone have published there...so different!..this brazilian forum is a business..they sell things there..so, a real DIY man is not a good idea as people prefer to build my things, then to buy their stuff.

I am uploading to youtube the "all about the Dx Super A"..showing it is a Dx Blame ST modified and tuned and showing each different modified part and supressed parts and differences in adjustments..also that we can use external Super A pcboard avoiding guys to prepare a new pcboard layout.

And Juan is making the new pcboard layout for us too.

It eated the Dx Blame ST circuit in the breakfast, despite it is almost the same amplifier, just tuned and modified in some parts..anything different...this time i have tuned by ears..last time was using simulator..and this is not that good....Dx Blame ST sounded lifeless compared to the Dx Super A - MKII (my Super A circuit, not Gradiente anymore and Dx Blame tweaked and tuned to optimize performance while listening)

Soon i will post the video link here, in portuguese and english..all bad english and bad portuguese but i hope gonna be helpful to you all.

regards,

Carlos
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Old 3rd November 2012, 02:35 PM   #115
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Default As i told you dear friends..here you have the video

I am uploading another one showing you simulator...also in two languages:

Dx Super A - all about - tudo sobre essa unidade - YouTube

regards,

Carlos
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Old 3rd November 2012, 03:41 PM   #116
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Default Here you have the final schematic.

regards,

Carlos
Attached Files
File Type: pdf Dx Super A - MKII - schematic c.pdf (55.8 KB, 229 views)
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Old 3rd November 2012, 04:03 PM   #117
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Default Here you have the second video..this one is from the simulator

Enjoy.... two languages:

All about the Dx Super A - MKII - tudo sobre esse amp. - YouTube

regards,

Carlos
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Old 3rd November 2012, 04:45 PM   #118
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Default Use 1uf with 10 percent tolerance maximum in the input

Please, do not change this one..it is a hell critical.

My audio source is no good..the workbench one...the computer and also the satelite receiver sounds better.

regards,

Carlos
Attached Images
File Type: jpg 001.JPG (242.6 KB, 394 views)
File Type: jpg 004.JPG (832.7 KB, 387 views)
File Type: jpg 010.jpg (926.3 KB, 344 views)
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Old 3rd November 2012, 05:06 PM   #119
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Default A friend asked about comparison with the old and good Dx amplifier

the one has loosen, longer, non precise but awesome bass.

He asked me if the Dx Super A is a better amplifier and if it has a good bass.

My answer:

NO!...it has not all that bass, but all other things are much better...it is a comparison in between a cold and old tea (oxidized and bitter taste) together salted cream cracker and a hot delicious fresh English tea together butter Danish biscuits.

Dx amplifier, the standard is fine..but in that comparison it is cold, oxidized and bitter....of couse if you never listen the Dx Super A you will never know that and will be happy for eternity not knowing the truth.

Compare a banana with strawberry with Chantilly cream....the second is much better.

A hot coffee or a hot Belgium Chocolate?

Water or beer?

Lemonade or Coca Cola?

These biscuits shown are from Petropolis (tow of Emperor Pedro from Brasil)... a german town in the State of Rio de Janeiro, up the mountains...this is so good as Danish biscuits.... i do think these ones are better because the kind of taste of the butter we have there.

regards,

Carlos
Attached Images
File Type: jpg biscoitos-amanteigados-300x187.jpg (58.1 KB, 296 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 3rd November 2012 at 05:13 PM.
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Old 3rd November 2012, 05:21 PM   #120
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Default Dx Corporation, the Union of audiophiles...the good ones

reserve to itself the right to update and upgrade schematics and circuits in order to evolute their units..the best unit of today may be a junk in the future due to modifications and circuit evolution.

regards,

Carlos
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