Please, do it Juan, but inform the guy the pcboard you made was not assembled to
be tested...so.... you cannot give him 100% guarantee that it has no mistakes.
The only way we can be sure the pcboard has no mistakes is building it to be sure.
Because was based into a previously tested pcboard layout (Nabuco one) then it is possible that it is correct..but we cannot be sure if a mistake was made there when changing things to improve the layout.
He may want a positive or negative image related the copper tracks only..one in Black to hot iron transference method and other in white to photo chemical etching process.
regards,
Carlos
be tested...so.... you cannot give him 100% guarantee that it has no mistakes.
The only way we can be sure the pcboard has no mistakes is building it to be sure.
Because was based into a previously tested pcboard layout (Nabuco one) then it is possible that it is correct..but we cannot be sure if a mistake was made there when changing things to improve the layout.
He may want a positive or negative image related the copper tracks only..one in Black to hot iron transference method and other in white to photo chemical etching process.
regards,
Carlos
Yes! mister Carlos is right, I did this layout for my personal use but if someone what it to try I can not said it has no errors because I copied for myself for later, as Carlos said it has to be tested with the iron etching technique and I want it to try maybe later and I still really busy putting together the Dx Blame Supercharged I'm not done yet with it, but... if you want it to try is on your own risk I can place the files here and you try out but with not guaranties is my personal layout still 😀, the original work is on this website if you want it to go. check it out bro 😛 I just want it to add something, my name is not on the board because I did not created this board in the pass few months by reading a lot from the forums I have learned that is some one create a layout and all you guys that work so hard to put together a layout of any kind of circuit you got to give credit to the designer it take days even months to come out with the right layout that works I just learn that, I personally copied but is for me to learn but place my name on the board it was a mistake a made a couple of time I be honest with you guys a really big example mister Alex MM and Nabuco are my inspirations now is Herman too, but yeah people if you copy a layout please do no place your name on the board like I did it was my mistake and I learn that now, give credit to the original creator he or she deserved is a way of art respect those guys! I said that from my heart guys.
Greg's Web Site Greg's Web Site has all the info you need for etching your board, bias adjustment all that good stuff. 😀
Regards
vargasmongo3435
Greg's Web Site Greg's Web Site has all the info you need for etching your board, bias adjustment all that good stuff. 😀
Regards
vargasmongo3435
Attachments
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I am publishing the new high power bass machine..the Dx Custom at the
Dx amplifier thread.
There's a video there.... another video latter today.
regards,
Carlos
Dx amplifier thread.
There's a video there.... another video latter today.
regards,
Carlos
I have used the Dx Blame ST together the Super A module
and i have achieved awesome results.
Digital camera audio recording is not really fair compared to the real thing..but shows something about the quality...of course, the real thing is much better....naturally.
Dx Blame ST+ SuperA+Low pass+Blend+cheap speaker - YouTube
regards,
Carlos
and i have achieved awesome results.
Digital camera audio recording is not really fair compared to the real thing..but shows something about the quality...of course, the real thing is much better....naturally.
Dx Blame ST+ SuperA+Low pass+Blend+cheap speaker - YouTube
regards,
Carlos
People, in a Brazilian forum, received uncle charlie alike a king.
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
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
Attachments
As told you folks, here you have the video about modifications
From the Dx Blame ST to the Dx Super A
I am already uploading another video showing your simulator things.
Dx Super A - all about - tudo sobre essa unidade - YouTube
regards,
Carlos
From the Dx Blame ST to the Dx Super A
I am already uploading another video showing your simulator things.
Dx Super A - all about - tudo sobre essa unidade - YouTube
regards,
Carlos
Congratulations, Carlinhos! 😀
BUT, just when I found the time to build the first channel of the Blame ST you come with a better amp!
Two days ago I finished one channel of the amp, with test PS, and it worked OK. Sound appeared to me as more refined than the DX HRII and I got superb bass (I used a secret weapon, though 😉 ). Unfortunatelly, on second power-on, yesterday, I made honour to your nickname 😀 and R22 and R18 fried...I supose bias was to high in the morning. Anyway, now I will investigate what happened and replace the broken parts to start again. Do I target 0.52V at the base of output transistors? I was working with 0.55V...
The sound reminded me one afternoon at a friend's place listening to SET + old Altec speakers. 😎
BUT, just when I found the time to build the first channel of the Blame ST you come with a better amp!
Two days ago I finished one channel of the amp, with test PS, and it worked OK. Sound appeared to me as more refined than the DX HRII and I got superb bass (I used a secret weapon, though 😉 ). Unfortunatelly, on second power-on, yesterday, I made honour to your nickname 😀 and R22 and R18 fried...I supose bias was to high in the morning. Anyway, now I will investigate what happened and replace the broken parts to start again. Do I target 0.52V at the base of output transistors? I was working with 0.55V...
The sound reminded me one afternoon at a friend's place listening to SET + old Altec speakers. 😎
It was oscilating while you had the supply voltage increasing
This means your voltage is increasing slowly due to big condensers in the supply...also check the value of the rail resistor, the one that is burned nearby the VAS, right. side of the pcboard.
Have you increase the values of rail resistors?...if you did it, then reduce them.... some amplifiers did that...they also oscilated when you switch the power off and then they produce a noise when the voltage was dropping..there's a point, or a voltage, that creates some unstability.... the voltage grows up fast when we power on and voltage decreases when we power off... in these two moments this may happens for a milisecond or less..but if your supply increases voltage slowly or decreases slowly, then the critical point happens for too much long time and starts an oscilation because the whole amplifier is not correctly biased under this circunstances...it is going to stabilize..so, it is a non stabilized stabilizing sittuation..on the run..on the go.
This amplifier is not too much distant from the oscilation threshold..this is a dangerous trick to increase treble... producing and interesting effect...some guys call this defect, depending their mood or their intention.
You may have some transistor shorted..... circuit have oscilated.
Increase miller capacitor, install the 1K resistor in series with the BC546 colector (first VAS) install 33 ohms in the first second VAS emitter (BD139) and check if you have too much capacitance in your supply.
You was not lucky...seems you have a very high gain transistors.
Try to increase the gain resistor too.. i do not remember the value..but it is in the second transistor from the differential base to ground through an electrolitic condenser.
Do not replace these parts without test transistors first.. differential, and VAS stages.
If your condensers are not that big.... if you have not the noise after you power off (2 seconds after) then you got the terrible prize to be facing a very strange trouble.
regards,
Carlos
This means your voltage is increasing slowly due to big condensers in the supply...also check the value of the rail resistor, the one that is burned nearby the VAS, right. side of the pcboard.
Have you increase the values of rail resistors?...if you did it, then reduce them.... some amplifiers did that...they also oscilated when you switch the power off and then they produce a noise when the voltage was dropping..there's a point, or a voltage, that creates some unstability.... the voltage grows up fast when we power on and voltage decreases when we power off... in these two moments this may happens for a milisecond or less..but if your supply increases voltage slowly or decreases slowly, then the critical point happens for too much long time and starts an oscilation because the whole amplifier is not correctly biased under this circunstances...it is going to stabilize..so, it is a non stabilized stabilizing sittuation..on the run..on the go.
This amplifier is not too much distant from the oscilation threshold..this is a dangerous trick to increase treble... producing and interesting effect...some guys call this defect, depending their mood or their intention.
You may have some transistor shorted..... circuit have oscilated.
Increase miller capacitor, install the 1K resistor in series with the BC546 colector (first VAS) install 33 ohms in the first second VAS emitter (BD139) and check if you have too much capacitance in your supply.
You was not lucky...seems you have a very high gain transistors.
Try to increase the gain resistor too.. i do not remember the value..but it is in the second transistor from the differential base to ground through an electrolitic condenser.
Do not replace these parts without test transistors first.. differential, and VAS stages.
If your condensers are not that big.... if you have not the noise after you power off (2 seconds after) then you got the terrible prize to be facing a very strange trouble.
regards,
Carlos
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Yes, Doctor DX, that were the symptoms: the speaker made "brrrrr" then smoke got in my eyes. Q10(BD140) is shorted.
Strange, I used (as always) a Variac to set the bias (with resistor instead of speaker) and no fumes appeared, even if V increased very slowly...
My rail resistors and base stoppers are 33R and the caps in board are 470uF (though the main are Rubycon ZL 100V), while the PS is only 12mF per rail.
So no regulated supplies for this amp, right?
It would be lovelly to see the schematics for the mods for a Super A 😉
Thanks for your help!
Ah! I forgot to thank Metal and Rudi! Thank you guys!
(though the holes for the fuse-holder were too small, haha)
M.
Strange, I used (as always) a Variac to set the bias (with resistor instead of speaker) and no fumes appeared, even if V increased very slowly...
My rail resistors and base stoppers are 33R and the caps in board are 470uF (though the main are Rubycon ZL 100V), while the PS is only 12mF per rail.
So no regulated supplies for this amp, right?
It would be lovelly to see the schematics for the mods for a Super A 😉
Thanks for your help!
Ah! I forgot to thank Metal and Rudi! Thank you guys!
(though the holes for the fuse-holder were too small, haha)
M.
I am inspecting the Dx Blame ST green boards and i perceived
too much long copper tracks to the input....i am making a modification and the next pcboard layout will have this fixed.
I am uploading video right now to inform Juan Vargas and Zimmer what i want from their pcboard layout about this input.
You must remove all transistors and measure them out from the pcboard..use dessoldering tools or soldering pump...this is better and reduces the time wasted to search using multimeter when the transistors are assembled into the circuit..better to take them off and measure with calm.
Then replace the burned resistors, and make the modifications i have suggested in the last post.
The Dx Super A schematic is the Dx Blame ST schematic with some modifications in values...there are two new resistor in series with the first VAS colector and some other minor modifications...the circuit super A can be made separated and installed latter..the stand by bias is adjusted in 250 miliamperes each rail... please take a look at the Dx Super A thread and watch my videos please.
There you have the schematic and all you need.
regards,
Carlos
too much long copper tracks to the input....i am making a modification and the next pcboard layout will have this fixed.
I am uploading video right now to inform Juan Vargas and Zimmer what i want from their pcboard layout about this input.
You must remove all transistors and measure them out from the pcboard..use dessoldering tools or soldering pump...this is better and reduces the time wasted to search using multimeter when the transistors are assembled into the circuit..better to take them off and measure with calm.
Then replace the burned resistors, and make the modifications i have suggested in the last post.
The Dx Super A schematic is the Dx Blame ST schematic with some modifications in values...there are two new resistor in series with the first VAS colector and some other minor modifications...the circuit super A can be made separated and installed latter..the stand by bias is adjusted in 250 miliamperes each rail... please take a look at the Dx Super A thread and watch my videos please.
There you have the schematic and all you need.
regards,
Carlos
Dear Mergulhão,
Please let us know more details about DX Precision Amplifier. I had i look on its schematics in the Greg and become interested in details or even in a PCB set if avalable.
Regards From Brasil (with 'S' as we write it)
Ronaldo
Please let us know more details about DX Precision Amplifier. I had i look on its schematics in the Greg and become interested in details or even in a PCB set if avalable.
Regards From Brasil (with 'S' as we write it)
Ronaldo
We do not have this amplifier anymore..no pcboards available
É velho pra burro, e já está superado por muitos outros modêlos.
It is very old and already overcome by other models.
In this moment, no high power model with pcboards available.... search the MKIII Hx thread to see if there's someone that wants to sell their boards, as some guys have not build...some guys have ordered pcboards but have never assembled.
Forget the Precision..... it lost the Precision as times goes passing by.
regards,
Carlos
É velho pra burro, e já está superado por muitos outros modêlos.
It is very old and already overcome by other models.
In this moment, no high power model with pcboards available.... search the MKIII Hx thread to see if there's someone that wants to sell their boards, as some guys have not build...some guys have ordered pcboards but have never assembled.
Forget the Precision..... it lost the Precision as times goes passing by.
regards,
Carlos
I am revisiting the Dx Blame ST, upgrading my computer monitor amplifier
and you will be informed about that.
A video is being uploaded, the part one, the introduction explaining what i gonna do...then you will see a second video in a matter of a week showing you the unit already upgraded.
regards,
Carlos
and you will be informed about that.
A video is being uploaded, the part one, the introduction explaining what i gonna do...then you will see a second video in a matter of a week showing you the unit already upgraded.
regards,
Carlos
Attachments
Here you have the video showing the Dx Blame ST that will be
modified in power level and power supply.
Dx Blame ST - Revisiting. - YouTube
regards,
Carlos
modified in power level and power supply.
Dx Blame ST - Revisiting. - YouTube
regards,
Carlos
Here you have the part 2 video and the test video.
Dx Blame Revisiting part 2 - YouTube
Dx Blame revisited test - YouTube
Almost no noise from mains.
regards,
Carlos
Dx Blame Revisiting part 2 - YouTube
Dx Blame revisited test - YouTube
Almost no noise from mains.
regards,
Carlos
Hello Mr.Mergulhao
Can you post power supply schematic and layout?
and please explain what SUPER A board is?
Thanks
Can you post power supply schematic and layout?
and please explain what SUPER A board is?
Thanks
Well Soheil95...moderators moved the supply to the supply forum
here you have the adress.... a pity, as usually people search for Dx things inside Dx amplifier threads.
http://www.diyaudio.com/forums/powe...put-adjustable-stabilized-power-supply-2.html
Layout is not ready yet...soon you gonna have it.
We have videos too... explaining how Super A operates and several video showing tests...please go to my channel and subscribe there, also click in fingers up because this helps to increase hits and popularity...when popularity is high, then huge number of folks goes there.... huge number of folks going there will increase the number of guys assembling my amplifiers...increasing the number of guys assembling my amplifier i will feel more and more happy...they are DIY, so, no money in this stuff... a clean thing, has not the dirty money inside the Corporation, the biggest Union of audiophiles of this planet...only the good ones have join us. All i have from this activity was a couple of free boards...the real payment is to see people happy and to share my amplifiers.
Also i am not paid to be in Youtube...i have not accepted their invitation to be paid ...because i want my freedom to post whatever i want, not to make merchandizing and propaganda, not to have advertisement flashing in my videos and being free to use the songs i want..if copyrighted or not....i want to continue to be free... imagine what i said to them where to put the money they offered me...yes!... was there!
Money shows the most evil part of humans, they become selfish and dangerous..dirty thing...needed for survival but something that shows all the bad things we have.....make people betray others, they go corrupted.
I do not use electronics to my survival, to pay my bills, it is not for living..it is for pleasure only...i have my Government job... for whole life, i made tests for that... first place competition with others 26 thousand guys.
Here you have some videos...there are more 500 videos there...several about Dx Super A, and Super A and that kind of stuff:
(1) How Dx Super A works, como funciona - YouTube
(2) Como funciona o Dx Super A, how it works - YouTube
Here you have my channel adress in the Youtube:
Carlos Mergulhão - YouTube
regards,
Carlos
here you have the adress.... a pity, as usually people search for Dx things inside Dx amplifier threads.
http://www.diyaudio.com/forums/powe...put-adjustable-stabilized-power-supply-2.html
Layout is not ready yet...soon you gonna have it.
We have videos too... explaining how Super A operates and several video showing tests...please go to my channel and subscribe there, also click in fingers up because this helps to increase hits and popularity...when popularity is high, then huge number of folks goes there.... huge number of folks going there will increase the number of guys assembling my amplifiers...increasing the number of guys assembling my amplifier i will feel more and more happy...they are DIY, so, no money in this stuff... a clean thing, has not the dirty money inside the Corporation, the biggest Union of audiophiles of this planet...only the good ones have join us. All i have from this activity was a couple of free boards...the real payment is to see people happy and to share my amplifiers.
Also i am not paid to be in Youtube...i have not accepted their invitation to be paid ...because i want my freedom to post whatever i want, not to make merchandizing and propaganda, not to have advertisement flashing in my videos and being free to use the songs i want..if copyrighted or not....i want to continue to be free... imagine what i said to them where to put the money they offered me...yes!... was there!
Money shows the most evil part of humans, they become selfish and dangerous..dirty thing...needed for survival but something that shows all the bad things we have.....make people betray others, they go corrupted.
I do not use electronics to my survival, to pay my bills, it is not for living..it is for pleasure only...i have my Government job... for whole life, i made tests for that... first place competition with others 26 thousand guys.
Here you have some videos...there are more 500 videos there...several about Dx Super A, and Super A and that kind of stuff:
(1) How Dx Super A works, como funciona - YouTube
(2) Como funciona o Dx Super A, how it works - YouTube
Here you have my channel adress in the Youtube:
Carlos Mergulhão - YouTube
regards,
Carlos
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