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-   -   200W Class A Power Amp (http://www.diyaudio.com/forums/elektor/207652-200w-class-power-amp.html)

wengtech 27th February 2012 12:23 PM

200W Class A Power Amp
 
Hi im newbie here...
need to ask the expert, is this audio circuit worth to be build?
http://www.tasel.net/images/200W-MOS...58-diagram.jpg
are there any suggestion from you guys...
some said this is a pure class A and better than crescendo, what do you think.?

are there any errors with this circuit?

thanks before.

jeronimo2003 9th March 2012 12:23 AM

No, the transistors Q1 to Q10 are swapped NPN vs PNP. So I would not build according to this schematic. It looks like a crossbreed between the original cresendo, the mini cresendo and the axl, but like I said with errors.

Perhaps it's better to start with a proven design and learn from this. I build my cresendo many years ago, and had quite trouble to get is osculation free.
May I suggest to take a look at ESP Projects Pages - DIY Audio and Electronics.
Lots of usefull information at that site.

I will not burn my fingers on the discussion between class A and AB (this design). In principle class a is better, but there are many constraints. Power output is most of the times much lower due to heat dissipation. Learn and make up your mind.

dungdochi1978 9th April 2012 04:06 PM

why
 
Quote:

Originally Posted by wengtech (Post 2924715)
Hi im newbie here...
need to ask the expert, is this audio circuit worth to be build?
http://www.tasel.net/images/200W-MOS...58-diagram.jpg
are there any suggestion from you guys...
some said this is a pure class A and better than crescendo, what do you think.?

are there any errors with this circuit?

thanks before.

i thing this circuit is ok accept change over terminal of power supply (+,-)

AndrewT 9th April 2012 04:44 PM

There is no way that a 2pair of Lateral mosFETs can get anywhere close to 200W of ClassA.

This is so obvious, that I wonder what planet you are on, it's not our Earth.

dungdochi1978 9th April 2012 04:54 PM

class A and then will be AB
 
Quote:

Originally Posted by AndrewT (Post 2978658)
There is no way that a 2pair of Lateral mosFETs can get anywhere close to 200W of ClassA.

This is so obvious, that I wonder what planet you are on, it's not our Earth.


AndrewT 9th April 2012 04:58 PM

No, ClassAB, inverting amplifier.

Unusual input topology.
Don't like R22 & 23.
I'm not familiar with the Q9 & 10 arrangement.
The PSU seems to have been swapped, or is it the input stage that is swapped?

dungdochi1978 9th April 2012 05:18 PM

litter bit depend on bias adj
 
Quote:

Originally Posted by AndrewT (Post 2978673)
No, ClassAB, inverting amplifier.

Unusual input topology.
Don't like R22 & 23.
I'm not familiar with the Q9 & 10 arrangement.
The PSU seems to have been swapped, or is it the input stage that is swapped?

i dont know why they post wrong some pin of trans. on this circuit.
everything is the same other amp only change Q1,2,3,4,9 by Q5,6,7,8,10.
too many way for build up AMP class A. need check by oscilocope we will know exactly which class will have

manicjovica 17th May 2013 08:06 AM

go to axl amp on this forum.


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