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Old 20th September 2013, 02:28 PM   #161
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Hello guys boards arrive and here are some images of them, I apologize if my pictures are not well take it I'm not good at that I try my best.


Regards
Juan
Attached Images
File Type: jpg Dx Super A top.jpg (507.9 KB, 335 views)
File Type: jpg Dx Super A bottom.jpg (481.6 KB, 304 views)
File Type: jpg Dx Regulator top.jpg (548.2 KB, 299 views)
File Type: jpg Dx Regulator bottom.jpg (440.6 KB, 274 views)
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Old 20th September 2013, 04:31 PM   #162
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what a nice PCBs ! well done ! i'm waiting for the wiring !!
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Old 20th September 2013, 04:45 PM   #163
AndrewT is offline AndrewT  Scotland
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Nice big pads to get your soldering iron tip onto.
Components with value and name printed on.
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regards Andrew T.
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Old 20th September 2013, 09:20 PM   #164
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Default Group buy link

Here you have it.

Dx Super A and Dx Regulator Group Buy Interest

regards,

Carlos
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Old 22nd September 2013, 09:49 PM   #165
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Default About power dissipation into the series pass transistor

into the Dx Power supply.

Here you have a study of the worst case scenario..... i cannot suggest you heatsink brand, model and code number because i do not use the traditional method to select heatsinks...i use aluminum blade and my calculation is made to discover how many watts that specific heatsink will dissipate in audio watts, not heat watts..something different that apply directly to my own needs to use junk heatsinks.... as i did that since i was very young...when i was a kid and had no money to buy a heatsink...so...a method was developed to figure out if the that specific cooking pot will be good to be transformer in a heatsink.

But you have watts...heat watts..then you select your heatsinks..one to each rail...they must hold three power output transistors...must have a room for that.

Worst case means that real life your heatsinks gonna be warm..not hot...they may be 10 degrees above the environement temperature.

regards,

Carlos
Attached Images
File Type: jpg Dx Power supply dissipation.jpg (609.6 KB, 245 views)
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Old 23rd September 2013, 06:07 PM   #166
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Default Pcboards are going to finish...almost half of them already shipped

Thank you folks.

I am sure you gonna like this amplifier.

regards,

Carlos
Attached Images
File Type: jpg Juan pcboards 2.JPG (773.3 KB, 105 views)
File Type: jpg Juan pcboards 1.JPG (783.2 KB, 71 views)
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Old 26th September 2013, 07:14 PM   #167
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I have a couple questions please.

Can the BD139 be mounted on the main heatsink with extended wires?

Can MJL21193/21194 be use for the outputs?

Thanks, Terry
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Old 26th September 2013, 07:46 PM   #168
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In my case mister Terry I use MJL3281A and MJL1302A and I didn't have no problems, MJL21193/21194 are good ones too, Carlos suggested MJL4281A/4302A but you decide what is best for you.

the BD139 do you mean this one marked in red in this image? I have seen friends installed by wire well insulated to the main power heat sink it can be done why not? hey guess what? I just got my new solder yeah!

Regards
Juan
Attached Images
File Type: jpg Dx Super A this one.jpg (257.6 KB, 139 views)
File Type: jpg let rock.jpg (801.5 KB, 151 views)
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Old 26th September 2013, 07:58 PM   #169
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I know that Carlos suggests MJL4281/4302, and I have several, but would rather save those for Amplifiers and use the MJL22193/94 here if there will be no difference. I have lots of these and they seem to be not as good for amps unless designed for them. I thought maybe they would work just as well here as they serve a different purpose. Still learning. Sorry about the BD139 question, I forgot what thread I was in. Since I already asked, I was talking about Q39.

Thanks, Terry
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Old 28th September 2013, 06:36 PM   #170
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Default NO!... do not use these transistors Terry

I have checked..these transistors oscillate....they are the only ones i said to Brazilians not to use.

Do not use them together Dx Super A.

Man....gladly you told me...you would kill your tweeters and also kill your power amplifier...cannot use them without make huge modifications.

I do not instruct the modifications as these transistors are a hell in earth..these ones and MJ340/350

regards,

Carlos
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