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Old 31st March 2010, 04:45 PM   #1081
PB2 is offline PB2  United States
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Did the layout and fabricated the chassis and power supply when I
was 16 years old, finished the amp in college when I was able to
get the correct output transistors:
Click the image to open in full size.

There was one defective output from the start, then it worked
flawlessly for more than 15 years - needs to be recapped now.
I used nine 3000 uF 100V caps for the pos and negative supplies.
for a total of 27,000 uF on each.

That is a Hafler 500 on top for size comparison.
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Last edited by PB2; 31st March 2010 at 04:49 PM.
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Old 31st March 2010, 05:38 PM   #1082
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Default I ma glad to know Pete...so..you are a brother..started very young alike me

I am glad to know.

My supply does not keep the voltage stable as you know Pete.... for the pulse, during some miliseconds, i really have much more voltage than the specifications, the datasheet limit..but time passing, the voltage drops.

This means, really the transistor can hold more than 80 volts peak to peak from colector to emitter.... they have informed 80 volts as guaranteed voltage..in the reality, the transistor can hold much more....or... these ones i have here, the ones used.... i am lucky and they can work with higher voltage...and i have proved that with the recordings made.

We do not need to use transistors using voltages higher than normal, for sure we should not..but, from time to time..when you have not other one..and knowing your supply will have voltage drop..you can even use..to take some risk.

But keeping supply voltage stable...injecting 1 volts in the input..hehehehehe...it is possible i have it burned..will not try that..for sure...i am very lucky the transistor is holding all that voltage..but it is much better to design thinking the worst case.

My electrolitic condensers...some big ones..the blue ones..are 40 volts...they are working in 55V..another "guaranteed specification"..... they will be saying, in the reality:

- "40 volts is guaranteed..if you want to try more..it is up to you..your problem!"

Of course factory is not constituted by idiots..people there has brain too...so..they produce condensers to 50 volts and rate them to 40...as mains have fluctuation of voltage..variation of voltage and people can install in the voltage limit..the rated voltage..then the mains increase 20 percent..ahahahaha!...pow! paft!... so..to avoid these accidents they under rate their condensers...for safety reasons..or the owner may install in a 40 volts supply..and them an accident may happens...also capacitance...they are 20000uf painted in the blue cap..... i have measured and real thing is 23000uf one of them..and 22000uf the other.

Because if buyers find more capacitance will not complain and will say the condenser is excelent..the opposite will burn the brand image..people will start to say awfull things if specified is higher than measured....but the opposite people accept!

regards,

Carlos
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Last edited by destroyer X; 31st March 2010 at 05:47 PM.
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Old 31st March 2010, 09:51 PM   #1083
PB2 is offline PB2  United States
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I know that you are going to do as you want but I will just offer the problem that I see here. If you take a look at the data sheet here Figure 4 SOA:
http://www.fairchildsemi.com/ds/BD/BD139.pdf

The flat part of the curve is max current limited, the first downward slope is power limited, the increase in slope is the power rating being reduced due to secondary breakdown at higher voltages. Higher voltage and newer parts have better secondary breakdown characteristics.

The BD139 will take about 120 mA at 50V due to secondary breakdown issues, this assumes a perfect infinite heat sink and an ambient temperature no higher than 25 deg C. De-rate further for increased ambient/working temperature and limited heat sink. The issue is under short circuit conditions where the driver must supply enough base drive to blow the fuse and there is nothing to give across the Vce with a shorted output. Fuses can easily take 500 ms or more to blow, depending on the level of overload. There is also likely to be a problem when driven hard into low impedance loads, but I'd have to do the analysis. I'd take a look at the MJE15030 series. Base stoppers can also help to limit the max current.

Further it is just not worth the risk using parts beyond their ratings when other parts
are available.
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Last edited by PB2; 31st March 2010 at 09:53 PM.
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Old 31st March 2010, 10:30 PM   #1084
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Default Pete..no one of my designs are using BD139 with voltages higher than 35 volts

This one is my home unit....i take the risk to myself.

Do not worry about that Pete...i am not asking forum people to use BD139 with 55 Volts supplies.

Relax...i am doing that since i was young, alike you did..i know what i am doing very well.

More than 5500 amplifiers built..several designed by me.... since 9 years old man...completing 49 years doing that.

I would ask you to stop the comments about the BD139 not to transform this in something much bigger and more important than really is.

I am using, in all my designs, i see you have never watched them, the ones uses more than 42 volts..then i am using 2SC2922 and 2SA1837.

I hope we can give a good end to this kind of conversation.

regards,

Carlos
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Old 31st March 2010, 10:39 PM   #1085
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Default Hudnes, from Brazil, is building Dx Blame ST units

Attached a picture.

Also we gonna have soon pictures from Luka (Polland) as he is installing his Dx Blame ST in a new enclosure.

regards,

Carlos
Attached Images
File Type: jpg Hudnes.jpg (151.2 KB, 325 views)
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Old 31st March 2010, 11:16 PM   #1086
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Default We already have 15 folks that build or are finishing the Dx Blame ST

Some of them are using the Dx Blame ES and very satisfied..they will not make modifications because they like the ES sound.

More pictures from Hudnes.

regards,

Carlos
Attached Images
File Type: jpg 31032010682.jpg (446.5 KB, 302 views)
File Type: jpg 31032010683.jpg (440.1 KB, 286 views)
File Type: jpg 31032010690.jpg (437.4 KB, 268 views)
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Old 31st March 2010, 11:22 PM   #1087
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Default More pictures from Hudnes Bomfim.

By the way...klaas, the Vyme material i told you today is appearing in one of his pictures:

Click the image to open in full size.

regards,

Carlos
Attached Images
File Type: jpg 31032010691.jpg (357.3 KB, 62 views)
File Type: jpg 31032010692.jpg (486.2 KB, 85 views)
File Type: jpg 31032010695.jpg (378.3 KB, 78 views)
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Old 1st April 2010, 12:10 PM   #1088
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Default This thread, or almost all threads i use to open, are real DIY threads

Here, i use to do all i can to help beginners, not the lazy ones that does not want to read and wants you to repeat hundred of pages of information, in special, for them.

Here we love respect, positive feelings..helping hand, cooperation, fellowship, group relations, cordiality and sharing ideas.

Here, i do not accept people trying to "give one on us"... arrogant people, extremelly idiot folks, around the clock consultants, in special the ones comes to analise your amplifier, when you have not invited them, have not hired them, have not needed them.. people that wants to be under the spot ligth should try a Theater or something alike (theatre?).... may try to go to movie production, to be on the stage...singing, dancing or shaking their bodies with a watermellon around their neck (heheheh)

In this place we want people that produces amplifiers, that assemble, copy, make clones,modify, assemble, dissassemble, use junk parts, find solutions, try something new...real DIYers...people that have produced several amplifiers, designed, or copied or other movement..but people that Do things by themselves!...people that works for this forum, contributes, in a non selfish way, posting pictures, posting schematics, providing follow up..beeing friendly, helpfull, usefull for the forum, for themselves, for the audio communitty.

The ones wants to bother, moved by envy, jellows, angry, hate and other awfull human feelings, please, turn around, go back to your cave and please..stay there counting slowly till 6 billions and one...then go out..have a breath, and back to the cave!

Humble people, that come to learn or to share ideas (not to redesign my amplifiers..wanna be a designer..then open your own thread and work!) are very welcome, in special builders that wants to build Dx Amplifiers, the ones related to the thread... wanna show your own creation?...open your thread and work for that!

Selfish people, that do not teach others..or do that only to give one on you, doing that together criticisms, trying to push you down will not be tollerate and prepare yourself for not good moments.

Moderator have not time (I think) to go reading all posts in all threads..so..they are not unable to understand what is going on in details inside threads, reason why they should let us decide the ones can post or not..the ones are usually annoying...because people use to bother without break the forum rules (they are not stupid)...so the go trying to bother, staying in the threads they're not welcome, and doing things that may be understood as cooperation..when in the reality is another thing...the name cannot be used here.

I am glad they are very few folks..... annoying selfish ones..that usually do not help folks with tender and kind intentions...always trying to prove they are good or better..when they are worse to the forum, because do not help, to do not contribute, and only teach us things, if can give one on you together the information published....i will take care of them.

Unbeliavable selfish and arrogant guys, bothering several folks, beeing unkind and generating complains in several threads, posting criticisms everywhere...negative, dark side people..years long in this forum..posting one amplifier or two... only copies of things already posted..the good ones, these ones they do not show us...if the have something..i think in the reality they have made nothing but bother others and to be unhappy and go trying to spread sulfur and and sadness everywhere..they cannot tollerate others having fun when they cannot be happy.

They may thing management does not know, or do not see what is going on... not only i am keeping them informing, and i hope they track the threads, but also forum users have perceived and are sending me mails with support, and criticising these guys behavior...they are three..the main ones...one is a little bit innocent, clever but retarded emotionally..this one will be with us...everybody knows he has problems...others may leave us in a couple of monthes.... at least i hope.

Enter with kindness..you gonna see you will be welcome.... enter to cooperate with others (not only yourself) and you will see will make good friends.

Vade Retrum Satanás (Get back devil!)

regards,

Carlos
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Last edited by destroyer X; 1st April 2010 at 12:22 PM.
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Old 1st April 2010, 12:23 PM   #1089
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Default I will collect some pictures of Dx Blame ST..the modified one, the most stable

pictures made by builders....and i will post in the builders thread...keeping this one for discussions and other things...the other one to take care of builders.

Here we have almost 15 people building..some built stereo and other built a single channel.

I had no complains... even Ekkart, that said the bias was a roller coster, had posted the amplifier is fine..and he is having not Todd Board and have not implemented the last modifications suggested.

I have entered the game suggested to post images, movies and scope details.... was not a good idea..this helped only the ones wants to push the amplifier down..will not scope anything more.

I have found troubles..was my supply..not the amplifiers..they are working fine with standard supplies..that supply have killed the Aksa 55, the DHR turbo, the Dx Amplifier and 5 times destroyed Dx Blame ES and once Dx Blame ST.

regards,

Carlos
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Last edited by destroyer X; 1st April 2010 at 12:27 PM.
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Old 1st April 2010, 04:46 PM   #1090
latala is offline latala  United Kingdom
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Carlos
I much admire your work for both quality and quantity
What program are you using for your schematic diagrams I am verry impressed with the print outs obtained from them
Regards Trevor
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