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Old 23rd December 2012, 07:05 PM   #1551
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Default Both Vostro... CCS sets the current mainly, but the bootstrapp

resistors are in series with the CCS feeding the VBE multiplier and the CCS colector to emitter junction.... we have some voltage drop there, but not so important than the CCS...mainly the CCS, but the bootstrap apply some signal back to the drivers.

I found sound better this way..with this combination.... also this is "marketing"..some guys believe in CCS, others in bootstrapp, this way i can make both sides happy.

Your flag Vostro?... what is your country?...you look latine by the Vostro (Italian meaning is "yours")... what is your native country despite you are in the other side of the fence.

I feel good vibrations from you man.... very good vibrations (sense from many others too..but yours are stronger and defined)...may i know something more from you...i see you want to help and not to show yourself...this is very good.... this is very positive.... want to help mankind not only to help yourself...i like that.

regards,

Carlos
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Last edited by destroyer X; 23rd December 2012 at 07:10 PM.
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Old 23rd December 2012, 09:00 PM   #1552
bonfis is offline bonfis  United States
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Quote:
Originally Posted by Vostro View Post
I still advice to keep the diode in place, if you want: trial and error reducing the miller cap, that's what I would do.

The diode should not audiblily affect slew before clipping, if it affects slew after clipping, thats a mute point.
But interesting, I'll also do some research and listening tests.

I don't have access to my workbench till January, I can't think of how to get rid to the positive side glitch.

Hoping the more experienced members, will pitch in with a solution .

I would not remove the resistor (R22) by VAS, it has a function, side effect might be small reduction in max output Vpeak, but this difference is not audible.
4R7 in diagram is small, I use bigger resistor, but depends on VAS current. (so I guess I loose even more form my max output Vpeak)

@bonfis, what transistor are you using for VAS.


Kind Regards
I'm using the original MJE 15030. You mention a function for R22. maybe you could describe that for me. I noticed that some of Self's designs do not include this resistor.
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Old 24th December 2012, 11:49 AM   #1553
Vostro is offline Vostro  South Africa
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@Mr Carlos, the flag is from Madagascar, but I'm from Scotish descent.
I came to this forum to learn about a passion of mine, electronics and audio, There are many many friendly and helpfull members on diyaudio, and I'm so pleased to be here.
I'm not an authority, but I build many circuits and try to scrutinise them in as much detail as I can, in the hope to learn as much as I can.
Knowledge is to be shared.

@bonfis, I've attached a pdf I put together for you, it's based on a example from Bob Cordells book, but I added as much detail as I could to make it an easy read.
Theres abit of maths, but very basic and only basic electronics knowledge needed, The formula can be taken as standard.
The circuits from D. Self arent always complete, since he deals with principles of the amplifier one stage at a time.
I wish he would post a diy circuit of his design for us.

Coming back to the amp, since we talking about degradation resistors, why not try altering them (make them higher), on VAS and Input.
lol But its a guess again
Output Iq (bias) will change and would need to be adjusted !!

Ive been to lazy to draw out the amplifier to simulate changes

Kind Regards,

Last edited by AJT; 26th December 2012 at 09:30 PM. Reason: removedcopyrighted material
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Old 24th December 2012, 12:30 PM   #1554
BMW850 is offline BMW850  Netherlands
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Default Audio Power Amplifier Design Handbook 4th Edition

Maybe this PDF is also usefull.
The PDF file is to large to post

(link removed by moderators- copyright violation)

Regards,
Rudy
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Old 24th December 2012, 07:21 PM   #1555
evette is offline evette  Canada
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Mr. REudy Thank you for posting this info. I,ll find out how to make payment for this book. Also MERRY CHRISTMAS EVERYBODY
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Old 24th December 2012, 07:44 PM   #1556
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Default Thank you Vostro.

Merry Christmas for all of you.

regards,

Carlos
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Old 24th December 2012, 09:16 PM   #1557
BMW850 is offline BMW850  Netherlands
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I have the coil on my MKIII on the right way wrapped as Patrick and Hugh Dean suggested and that is a whole improvement.
I had the coil wrapped the wrong way, see #1462

Patrick, thanks for the right solution
Dx Blame MHIII Hx: https://www.youtube.com/watch?v=AHp82_KWuTQ

Regards,
Rudy
Merry Christmas
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Old 24th December 2012, 10:01 PM   #1558
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Rudy,How does your amp sound now?
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Old 24th December 2012, 10:34 PM   #1559
BMW850 is offline BMW850  Netherlands
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The Dx Blame MKIII Hx amp sounds much better now did not expect this change gave this effect.
The MKIII Hx sound laid back read positive in compare to my Zap

Also I have other values resistors ordered for R23A and R23B
I am not know what value resistors to soldering, the 56R or the 100R
After that I skrew up the bias to 50mv

Regards,
Rudy
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Last edited by BMW850; 24th December 2012 at 10:39 PM.
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Old 24th December 2012, 11:19 PM   #1560
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I tried to find but I couldn't... can someone explain why the direction of coil winding is important?
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