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Old 24th December 2009, 03:13 PM   #1
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Default Please, help me with Self Blameless

Hi, everybody!

First of all, excuse me for my poor English. Im trying to improve.

I would like to built an amplifier that sound fine and are easy to do. So the Blameless from D. Self looks to me exactly what Im looking for. If anyone know another circuit, please, send me a message.

My doubt is about the transistors that I would like to use. Lets start:

Im using the schematic at figure 33 of the article:
http://www.dself.dsl.pipex.com/ampins/dipa/dipa.htm

And I have some transistors. Could I use:

TR7, TR9 - 2sc3281, 2sa1302
TR6, TR8 - 2sc4793, 2sa1837
TR13 - 2sc4793 (can I use the 2sc3790???)

TR1, TR5 - 2sa1376 (insted of bc 560)
TR4, TR12 - 2sc3478 (insted of bc 550)

TR2, TR3 e TR10, TR11 - 2sc3381 - 2sa1349 (2 transistor in 1 capsule)


Do you think it will work fine? Is it true that the bass is weak, as Carlos destroyer X said in his topic about DX Blameless? Or Carlos are made a mistake???

Anyone can help me with the pcb layout? Im trying to do, but Im having difficulties... If anyone could send me a layout, just to help me to do a new one...

Other information:
The power suply is +32,4V / -32,8V DC, with 45000 uF. Its sufficient simetry?

Ive built the loudspeakers, a copy from a brazilian diyer (a clone of Sublimes), and its sound very nice.

Click the image to open in full size.

And I would like to use a fine amp to drive this loudspeaker.


Thanks a lot. And marry christmas!
Ricardo (Ricks)
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Old 24th December 2009, 09:28 PM   #2
jaycee is offline jaycee  United Kingdom
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Speaking of Carlos... his amplifiers are all really good designs THe transistors you have there should work very well. The power supply is fine and will be good for about 30-40W of sound - which is plenty for domestic use.
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Old 25th December 2009, 02:04 AM   #3
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Default Thank you Jaycee

At least you trust me.... my dear Brazilian friend seems that do not trust very much. Congratulations, this is the spirit, do not trust people, build yourself, listen, compare, and obtain your own conclusions about.

Tem muita gente achando muita coisa sem saber de nada, s achismo... there are so too many folks that imagine a lot of things, but they really do not know.... there's only one way to know, to build, to compare and to analise....other things are opinions, and the value of that is none.

Now a days i an trying Blameless Designs, and they are driving me crazy because oscilations. also they could not survive the endurance test with 3,5 ohms plus 2,2uf in paralell.

Sometimes we fell the bass weak because of treble reproduction excelence.

I have solved the bass problem, now trying to make it more stable.

You do not need to ask my forum frienfs if i have made a mistake...i can answer you... i do mistakes all time long and everyday, because i am always doing things, and thanks lord, learning everyday because my own errors.

Ahahaha!, you talk alike me, indian way...me good!...marry christmas...algum casou com o natal.

Fui! (bye!)

Carlos
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Last edited by destroyer X; 25th December 2009 at 02:08 AM.
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Old 26th December 2009, 05:47 PM   #4
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Hi, everybody

Carlos, whats the problem if Im asking if you made a mistake???

By the way, why dont you aswer my questions?

First:
Can I use:
TR1, TR5 - 2sa1376 (insted of bc 560) ?
TR4, TR12 - 2sc3478 (insted of bc 550) ?
are they (2sa1376, 2sc3478) better than BC550/560?

Second:
Why the original circuit has oscilations? If I make a copy of the original, it wont work fine???

Last question:
"Sometimes we fell the bass weak because of treble reproduction excelence" Its not a good answer to the bass weak. Did you measure? Am I need a subwoofer? The original amplifier dont have a flat response curve?

Im just trying to built an amplifier that sound better than my Quasar 7070. Im not trying to built the best amp of the world. As I said, this circuit looks exactly what Im looking for.

Thanks a lot. And happy new year.
Ricks
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Old 26th December 2009, 06:06 PM   #5
Mooly is online now Mooly  United Kingdom
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I have built Dougs blameles Class B when it first appeared in Electronics/Wireless World using the official PCB's. It's good amp, technically very good, but.... sonically you can do better...
As Carlos says, you have to listen to different amps and topologies to appreciate where the differences are.
What I like you may not
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Old 26th December 2009, 06:08 PM   #6
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Default Please, stay with your Quasar 7070 Rick Rock.

My amplifier is not so good for you...keep the Quasar and be happy.

regards,

Carlos
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Old 26th December 2009, 06:09 PM   #7
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Default Mooly, will not eat meat today in because of you my dear friend.

But may i have some milk?

ahahahhah!

regards dear Mooly.

Carlos
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Old 26th December 2009, 06:21 PM   #8
Mooly is online now Mooly  United Kingdom
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Merry Christmas Carlos... we had snow and today rain
Attached Images
File Type: jpg Snow.JPG (163.6 KB, 366 views)
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Old 26th December 2009, 09:10 PM   #9
jaycee is offline jaycee  United Kingdom
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Carlos, i trust your ears and experience I have not built your amps but have seen the development of them, and the schematics.. and they look like good solid designs.

Personally I prefer the "differential VAS" type amps as used by ostripper in some of his Frugalamps, although right now I am looking at the Tom Holman "APT" topology.
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Old 27th December 2009, 12:59 AM   #10
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Default Thank you dear Jaycee.

A happy new year for you and your entire family.

regards,

Carlos
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