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Attention AKSA 55, Hugh is thinking in let us see schematics on forum
Attention AKSA 55, Hugh is thinking in let us see schematics on forum
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Old 13th October 2005, 11:29 AM   #331
edl is offline edl  Hungary
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Dear Mod_Evil,

Increasing the value of Miller cap will improve stabilty (and decrease high freq response of the whole amp). If you decrease the value, the stabilty will become worser (but the high freq response will be better).

Regards,

P.S.: 47pF is a good compromise. If the CB-capacity of the VAS transistor is high, you can go lower with the value. If the amp oscillating, you need to use higher value. But don't go higher then 100pF.
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Old 13th October 2005, 01:38 PM   #332
mod_evil is offline mod_evil  Brazil
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edl, This is a secret of the amp. Use 33pf this is more better than the 68pf value.
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Old 14th October 2005, 07:36 AM   #333
AndrewT is offline AndrewT  Scotland
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Hi,
that's the second time I have tried to access a schematic on IMAGESHACK. It does not show any detail (unreadable) and the "click on" does not work.
Mod Evil if the amp is better with a smaller Miller comp cap then the amp was over compensated in the first place, bad design or playing safe with a wide spread of component tolerances. Both indicators of poor quality.

Putting in a smaller Miller comp cap will decrease HF stability but also increase the feedback in the global regime which in turn will reduce the hi frequency distortion of the output stage. This could be the effect you are hearing. But this solution will only apply to an amp that is already over compensated. There is another mechanism that I am aware of that may make the amp sound better;- the smaller cap in the VAS stage will put less load on the previous stage (LTP?) and the easier loading may make the earlier stage perform better.
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Old 14th October 2005, 01:32 PM   #334
destroyer X is offline destroyer X  Brazil
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Default Yes folks!..let's go!

C'a marche! (copyrigth from Carlos FM)

regards,

Carlos
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Old 11th November 2005, 04:11 PM   #335
Mindaugas is offline Mindaugas  Lithuania
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Default My AKSA amplifier mod :)

http://www.kuprevicius.kaunas.lm.lt/AKSA_FINAL.jpg

It looks good in simulation (SWCAD). But how it works in real life I don't know. Now I' m making PCB for this mod. So if there are some big mistakes (amp will sound terrible or it will blow at first test )
Please, help me to correct them .


Thanks in advance.
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Old 11th November 2005, 04:17 PM   #336
PMA is offline PMA  Europe
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Mindaugas,

is it AKSA what you have posted? I feel like I was 33 years younger when I look at that image ...

Pavel
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Old 11th November 2005, 05:24 PM   #337
Mindaugas is offline Mindaugas  Lithuania
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I 've posted AKSA amplifier mod.
PMA,
I think you expected something different, on that image .

Here are some more different versions of mod:


http://www.kuprevicius.kaunas.lm.lt/AKSA_FINAL.jpg
http://www.kuprevicius.kaunas.lm.lt/AKSA_FINAL1.jpg
http://www.kuprevicius.kaunas.lm.lt/AKSA_FINAL2.jpg

which one is worth to try?
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Old 13th November 2005, 05:00 PM   #338
powerbecker is offline powerbecker  Germany
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Quote:
Originally posted by PMA
Mindaugas,

is it AKSA what you have posted? I feel like I was 33 years younger when I look at that image ...

Pavel

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Old 24th January 2008, 07:33 AM   #339
chalo is offline chalo  Argentina
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Im very willing to give a try to this amp, anybody willing to help?

Thanks!
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Old 7th November 2008, 06:28 AM   #340
AKSA is offline AKSA  Australia
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I've attached a conceptual schematic of the AKSA. Some details are missing, of course, but all detail is revealed in the kit documentation. I choose not to reveal all in a public domain; my IP, my prerogative.

I would prefer not to discuss the details of this ad insanem; this is a very simple circuit, the sound is all in the details.

Cheers,

Hugh
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