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Old 23rd February 2013, 11:03 PM   #581
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Hello guys! you know that I don't like to quick jejejeje I found this software and I thought it was terrible, but actually isn't that bad, I keep messing with it and I have a "prototype again of the heat sink, but!!! as Carlos mention not to extended high volume levels, or loads of speakers of 2 ohms, this heat sink is for normal use of the amplifier I will continue check because I love this type of things, I hope you guys like the idea also Carlos too, yes I know Carlos I'm a hard head jejejeje I don't like to give up. sorry measurements "about" 134mm 200mm

Regards
Juan
Attached Images
File Type: jpg Dx Super A 1.jpg (120.4 KB, 368 views)
File Type: jpg Dx Super A 2.jpg (103.5 KB, 351 views)
File Type: jpg Dx Super A 3.jpg (107.4 KB, 334 views)
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File Type: pdf Dx Heat Sink.pdf (4.7 KB, 28 views)
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Old 23rd February 2013, 11:26 PM   #582
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Quote:
Originally Posted by destroyer X View Post
even having a lot of care about you may face troubles while operating 4 ohms and 2 ohms.

Do use " L " adaptors only if you intend to operate 8 ohms.... this is what i found here.

regards,

Carlos
I think 8 ohms is the impedance that must be used to qualify for the HiFi.
2 ohms, it is not reasonable .
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Old 24th February 2013, 12:28 AM   #583
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Default We have some powerholics too mon ami

So, now i told them how to manage their addiction

Carlos
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Old 24th February 2013, 11:40 AM   #584
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Default As usual, i am working

regards,

Carlos
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Old 24th February 2013, 12:41 PM   #585
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Default Install transistors this way...english and portuguese message

Fix transistors this way, fixe TRs assim. - YouTube

regards,

Carlos
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Old 24th February 2013, 04:46 PM   #586
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Default I have assembled the Dx Super A into the Dx Blame ST pcboard

was adapted to operate 8 and 4 ohms only (one single pair of output transistors)

It is not ready...some parts must be adjusted and fuses should be installed..no bias trimpot, i will use fixed resistor instead.

You see the enclosures i gonna use..they are the Dx Blame ST model, now i will put Dx Super A in my main enclosure and transistors will go direct into the heatsink using mica insulators and thermal compound.

The Super A diodes and circuit will be below the pcboard assembled in a mini circuit board.

regards,

Carlos
Attached Images
File Type: jpg Dx Blame ST - wy.jpg (267.6 KB, 289 views)
File Type: jpg Dx Blame ST - zy.jpg (175.1 KB, 107 views)
File Type: jpg Dx Super A installed in Dx Blame ST pcboards.JPG (708.2 KB, 109 views)
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Old 24th February 2013, 07:46 PM   #587
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Default Now it is time to check, to clean, to measure resistances

from positive rail to ground, from negative rail to ground, from positive rail to negative rail, from output to ground and to inspect all solder points.

Then i will install series protective resistors to check bias, this one is using resistor preset, some kind of "plug and play" bias (trimpot replaced by a fixed resistor)

And then it is only pleasure and strong emotions when driving it hard.

You see..transistors direct into heatsink, mica insulator and thermal compound.... a fan will be installed too.

This is to 8 ohms and 4 ohms only.... reason why i am using only one output pair.

regards,

Carlos
Attached Images
File Type: jpg Dx Super A - one.jpg (624.0 KB, 99 views)
File Type: jpg Dx Super A - two.jpg (519.4 KB, 70 views)
File Type: jpg Dx Super A - three.jpg (566.5 KB, 80 views)
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Old 25th February 2013, 09:40 PM   #588
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Default Dream boys...and never give up...you gonna make it

I did it.

Since i was young i wanted to make my own amplifier..something i have calculated..something i new in details the operation, all tips and tricks...now i have it.

There are Dx amplifiers all over the world, schematics in the internet in several home pages, mentioned in many blogs an in several foruns.... i can die for age and my amplifier will be here....and to stay

Dream, do your own and let the buggers talk...just do it!

A dream come true. - YouTube

Carlos
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Old 26th February 2013, 02:53 PM   #589
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Hi Mr. Carlos,

I will be interested to see your plug and play, pls explain also how you do the adjustments and parts to change.

Thanks,
Wattodo
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Old 26th February 2013, 05:16 PM   #590
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Default It is a 330 ohms fixed resistor in the place of the bias trimpot

But this will not work with all BD139 you can find in the market...so....it may work to me and not work for you.

Fixed resistor is 470 ohms.... added to 330 we have, as a result, 810 ohms from base to emitter into the VBE multiplier transistor (bias adjustment transistor.... stand by current adjustment transistor)

Current can result too much big or too much small depending the gain you will have in your selected BD139...will not have same result as i have at my home unless you use the transistor i have at my home...ahahahahaha!

Plug and play the same way we had plug and play pcboards to computers in the past...never plug and play..we had the need of software and adjustment and to ask windows to search for a better driver.... it is a plug and play you plug and sometimes does not play the way you want...the same we had in computers.

You do not know me Wattodo, i love to be kidding as i have a very good mood, i use to be ironic related the lack of decense and truth we find in human kind..... plug and play was a hoax applied into the market!...not serious....and my plug and play is just to have fun...will be plug and play to me...only to uncle charlie, because i will plug and will play with it and will not bother if the current is a little bit higher or lower...will be plug and play only to me!

Plug and play, sometimes resulted fine..also this fixed resistor, sometimes, will be good.......... you inow what-to-do whattodo.

Carlos
Attached Images
File Type: jpg Milk Sheik.jpg (243.7 KB, 41 views)
File Type: jpg Dx Super A adjustments by Carlos Mergulhão 1.jpg (701.2 KB, 76 views)
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Last edited by destroyer X; 26th February 2013 at 05:39 PM.
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