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Old 20th December 2009, 11:10 AM   #11
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Default Give a good read dear Wahab, seems your translator failed with you.

Current is 35 miliamperes, voltage from colector and emitter, AC voltage is 20 volts , power is 0.7 watts.

What are you talking about my dear?

heheheheh...... what is the traditional beverage in your country my dear friend?

He is Cachaça, made using Sugar Cane...pure fire!

Want one?

regards,

Carlos
Attached Images
File Type: jpg Cachaça.jpg (158.3 KB, 1402 views)
File Type: jpg Dx Blame ES - testing.jpg (136.6 KB, 1359 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; 20th December 2009 at 11:15 AM.
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Old 20th December 2009, 11:19 AM   #12
wahab is offline wahab  Algeria
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hi, carlos

love the bottles!!

it s clear : BD139/140 are UNABLE to drive correctly the power output transistors when
the amp is pushed at high levels...as VAS, they are good, but not as drivers...

regards,

wahab
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Old 20th December 2009, 11:33 AM   #13
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I was weighing in to make some changes also in Blamelles, could help with simulator, what you think Carlos?

My suggestions are:

1-Remove the darligton and replace with a cascode;
2-Replace the driver BJT for mosfets;
3-Using an inductor "lighter" the output;
4-increase speed (Slew-Rate) to improve the resolution.

Does anyone have any opinion?
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Old 20th December 2009, 11:43 AM   #14
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Default I will do by myself, and after published the schematic you may open another thread

And produce your modifications.

Here we gonna have only one Dx Blame ES, something tested, guaranteed, reliable and tested.

Nada de futucar, faz o teu Rafa!.... not a good idea to tweak, make your own and give forum more options in the place to try to modify something that is working fine....if this was a good idea we will not have any amplifier made in this forum, as everybody wants to tweak a little...no troubles, tweak yours!

In a different way, the originality is diluted, a never ending design starts, each one with their own ideas...Wahab would remove BD139, you will open to all tweakers, others will change this and that... no amplifier will be ready this way...just an exercise of tweaking and not to finish the stuff.

Start form zero, make your choice into the schematic to start...can be even the blameless, the Dx Blame ES and go ahead..but open another thread instead to mess with this one.

Wahab... 50 years using BD139... thousands of amplifiers... several brands, all them using BD139...they forgot to ask you about the BD139/140, so, they forgot to have their designs to be transformed to junk..also the transistors forgot to explode as you said they are no good... poor transistor, they are already thinking themselves as beeing lovely ones.... the famous MJE340 and MJE350 i have tested..these are no good.

Give me a break man!... i am producing something from the glorious Doctor Self, inspired into one of our best engineers, a gift to the Corporation members, to make them happy with low distortion and the traditional deep bass from the Dx models.

regards,

Carlos
Attached Images
File Type: jpg 10 Khz.jpg (92.6 KB, 1309 views)
File Type: jpg 20 kilohertz thd.jpg (179.4 KB, 1183 views)
File Type: jpg Dx Blame ES at 100 Khz.jpg (135.9 KB, 1109 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; 20th December 2009 at 11:55 AM.
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Old 20th December 2009, 12:02 PM   #15
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I thought you would still make the changes, did not know that was already in the final version!
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Old 20th December 2009, 12:23 PM   #16
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Default It is all rigth...it is finished, i am just tweaking, tuning, for sonics

and this is done into resistances (currents) and capacitors..the topologie is not changed.

Topologie and surrounding auxiliary subcircuits that are not inside the audio patch, are the first decision, them is to tweak for sonics...VBEs are important (a lot), currents also, capacitor values are also important (a lot).

Um pouco de pó de pirlimpimpim ajuda... a little portion or unobtanium use to help, some golder electrolitic to obtain golden sonics (ahahahahah!)

I am uploading another video to Youtube, showing the deep bass i could have including the boostrapp into the amplifier.

regards,

Carlos
Attached Images
File Type: jpg Dx Blame ES during tests.jpg (101.4 KB, 265 views)
File Type: jpg Golden things.jpg (113.6 KB, 335 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; 20th December 2009 at 12:29 PM.
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Old 20th December 2009, 12:43 PM   #17
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Default Here is the video...i am thinking what to do next

for a while listening and comparing with the Dx amplifier standard,

Next i will tweak a little and will produce a nice schematic for you all.

My gift, a Christmas gift from the Corporation to the members and friends,

regards,

Carlos

YouTube - Dx Blame ES, modified, test 1
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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 20th December 2009, 03:17 PM   #18
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Default Total Harmonic Distortion

attached,

regards,

Carlos
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File Type: jpg Harmonic distortion and distribution.jpg (140.7 KB, 358 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
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Old 20th December 2009, 04:05 PM   #19
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Default Here is the schematic that is playing and will be under testing till next

Wednesday.

Dx Corporation reserves to itself the rigth to produce small modification those next days.

Of course remembers you the Blameless, half topologie is from Blameless, the idea came from Blameless...but it is a Dx Blame ES

Blameless does not use bootstrapp, and other things i have installed, all Dx traditional features.

You can build!...it works!

http://www.youtube.com/watch?v=8N1sPqKuiFs

regards,

Carlos
Attached Files
File Type: pdf Dx Blame ES - to publish.pdf (73.0 KB, 790 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; 20th December 2009 at 04:20 PM.
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Old 20th December 2009, 11:31 PM   #20
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Default Thank you folks.... almost 500 hits during a weekend is a must!

The amplifier deserves, the good work done by Self, and also my contribution to huge bass is there.

The devil's throat sound, the deep ocean drums from 30000 feet caves, the earthquake, the low tones from a thunderstorm ..all them can be reproduced, now, perfectly.... those sounds, reproduced into high levels, make you scared ,frightened, so real they are.

Also the bells, cymbals, hit hat and several metal hitted sounds were tested and they appeared much more present than i could listen usually, the Doctor Self input made that, also some tweak helped a lot, in special the phase advance into driver stop resistance and the reduction into the Miller (spreaded) and the feedback capacitor.

The amplifier is sensitive, the input capacitor, for instance, if you remove it and inject signal from the mains, touching your finger tip into the power amplifier's input, them you will listen some frequency beats that are typical from RF oscilations, heterodyne sounds.

Once again i have to thank Mr. Hugh Dean, he said, once, in 2004, the amplifier must be near the oscilation threshold to reproduce a good treble.... was interesting, those days he had not applied this into his units, i hope he is already applying the idea...works great into sonics.

Those early days i found this would result harshing..... i was wrong.

regards,

Carlos
Attached Images
File Type: jpg Dx case pic.jpg (176.9 KB, 205 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; 20th December 2009 at 11:49 PM.
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