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Old 2nd July 2011, 02:43 AM   #31
Bigun is offline Bigun  Canada
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Hi Carlos,

I'm not brave enough to tackle something this powerful, but it looks like you are making good progress on a challenging project!

Hope all is well with you.
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Old 2nd July 2011, 03:28 AM   #32
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Alex's PCB looks good. With full 20kuf X 2 decoupling onboard , at least separate the input/IPS-VAS ground. Separate ground for all small signal references (CCS , DC cap , input filter and input signal ground) , connect to midpoint of "dirty" rail ground. speaker ground should also have a faston right next to the main earth connection (2 fastons). Center 2 faston grounds , + rail , - rail , and small signal ground reference should be dead center of the board and meet in a star. The input ground should be "lifted" with 4.7-10R from the small signal ground.

Don't need those 2 470uF-63v local decoupling caps since main (10Kuf) decoupling is already onboard. I do it a little different (below), but have my main decoupling on a separate board (separate PS PCB).

Circuit wise , very robust - high current MJE VAS and MJE drivers will drive 5 pair VERY well. AOK !!
OS
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Old 2nd July 2011, 05:02 AM   #33
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by destroyer X View Post
But i am still moving a little.

Working with the MKIII and also the MAKO prototype... assembling once again with separated heatsinks in order to avoid insulators... trying to scape from thermal resistance... wood bellow is what insulates one heatsink to the other..some transistors, for CCS purposes, are insulated, others are not.

Well boys..uncle charlie is doing something...slowly but doing.

MKIII will have boards available, also schematic and layout..about the MAKO i do not know what gonna happens...maybe boards in other forum...not sure about.

I have the obligation to test it into the power that was ordered... 500 watts RMS continuous, undistorted, over 4 ohms reactive load..unclipped signal with less than 0.005% THD... i will use two fans removing heat from these fins.... the amplifier will produce much more than that...but this depends on heatsinks size and fan blower applied.... the increase above the power agreed will be made by the one will spread the amplifier wide world.... i will be giving follow up and support during 1 year, so, doubts(about heatsink size, output power and power supply details (SMPS) will be solved after release.

The idea is 1 Kilowatt easy ... and much more distorted.... sadly i will not be able to guarantee the survival at 1 Kw because i am unable to test that... my supplies cannot reach that..also heatsinks...so..the informed power (minimum guaranteed power) will be 500 wiskies.

This is the input only...there are errors to fix...this is only the start..trying to do something "less ugly".

Boards will be produced by Alex mm.

regards,

Carlos
Quote:
Originally Posted by destroyer X View Post
This amplifier can operate with 1 ohm load.

Power is very good and you can see down the schematic.

No one is offering boards, or producing boards, it is free to whole world, not an exclusive design...my gift to my forum friends.

Board was not tested, but the circuit was assembled to check.... the board layout was produced by Alex mm and he may provide you material to produce your own boards, to etch them at home.

Enjoy and if you need anything just ask...also you can contact me in my personnal email adress, but i have to explain in advance that i am not selling and that i have no boards to offer...this is a diy design, an open source to the whole world enjoyment.

nanabrother@hotmail.com

regards,

Carlos

Carlos ,

Sorry to hear about your health and situation fantastic this new amplifier, this migh just be the "one" .....



All the best my friend ....
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Old 2nd July 2011, 07:17 AM   #34
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Default 30 units are better than one Blameless unit to our forum and our community

dear Ljm_Ljm.... it is good to see you have researched into the good one.

This one is ready to go after long time of research and belong to a family, where they had progressive evolution... a Dx Corporation family (Union of nice audiophiles).... this has a history, a tradition... some kind of evolution in quality and power levels... has a destiny.

I do think it will be a very good idea you to open a thread about "My 30 Blameless variations, the evolution" and to post in a separate thread, your thread, these 30 amplifiers, each one of them with their schematic, comments, fourier graphics, AC graphics, voltage chart, current chart, pcboard layout, pictures of the units built ad review about each one of them...this will be a good cooperation to our people, to our forum, to the audiophiles and to the whole world..... you wlll add amplifiers in the place to suggest variations to mine one that is "ready to go"

Thank you very much, Dx Corporation feels honored by your offer but we decline as we want more options and not to change this one that will be keept the way it is unless appear a terrible mistake that may reduce reliability or impair the sonic quality.

regards,

Carlos
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Old 2nd July 2011, 07:23 AM   #35
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Default Well, thanks to all friend kindness, presence and support to the thread

Art M, John Geneva, A.wayne, Ostripper, Bigun, Tekko, Bigun, Andrew T and also to the silent readers... the ones that have read and have not posted comments.

The amplifier is simple, anything much different than the original Blameless with steróids.... no special solution, no custom design, just a variation around the same theme... sounds great as all Blameless amplifier does and was tested for your pleasure, enjoyment and safety.

regards,

Carlos
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Old 3rd July 2011, 04:31 PM   #36
ljm_ljm is offline ljm_ljm  China
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This is a very interesting. And very good structure.

Simple and its advantages. This will in we can repeat the desired results.

In this circuit, I have very much, and measurement of many of my friends use to listen to feel.

Sometimes we have to change it, and let the machine more suitable for yourself and friends listening habits.

This may not let I think sometimes I really should be put down the instrument to feel feel voice.

Although I in the test reached almost 0.000% THD 20 K
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Old 5th July 2011, 11:23 PM   #37
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Alex MM, the PCB layout looks very good but I feel the ground trace is too thin to the -ve PSU caps.
I would make the board a bit deeper than 80mm, rotate input conn. and use star ground for I/P reference, add a separate spkr. ground lug - all just like ostripper's post #33.

Is the capacitor across Vbe multiplier 100uF or 100nF? Do you need rail clamp diodes on the speaker output?
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Old 6th July 2011, 09:15 AM   #38
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Default Yes Prairiemystic... clamp diodes can be good

you can use them if you want.... the condenser is 100uF, but you can reduce till 22uf if you want, voltage there is very low, even a 6 volts condenser may fit.

Thank you very much dear harrydg... i would like to make your words mine..perfect answer to the provocation... that man will be ignored... wants to produce trouble..for sure he wants.. will go to the list of nasty bullies and there are some in the forum ... but there are few... this one already failed.

regards,

Carlos
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Last edited by destroyer X; 6th July 2011 at 09:19 AM.
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Old 6th July 2011, 01:03 PM   #39
alex mm is offline alex mm  Romania
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Default PCB rev 2.0 ......

.... I have layout again same schematic , just 10 ohms resistor was aded , to separate the power ground from signal ground ........not so big change , but will se the diference in real life when amplifier will be start , and play the music
Regards Alex .
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Old 6th July 2011, 01:50 PM   #40
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Originally Posted by alex mm View Post
.... I have layout again same schematic , just 10 ohms resistor was aded , to separate the power ground from signal ground ........not so big change , but will se the diference in real life when amplifier will be start , and play the music
Regards Alex .
Yes , you will. No hum at all , won't know the amp is even on until the first "blast" hits you.
Proper power supply "etiquette" applies to integrated power amp supplies , too.
Stars , stars , and more stars ..... (below)
Perfection - good job , alex.

PS- -55 on +55V side ... just a typo.

OS
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Last edited by ostripper; 6th July 2011 at 01:58 PM.
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