Kuei Yang Wang said:
Sorry old chap...but your preferred 'current feedback' arrangement ALSO uses a differential amp. for application of feedback...
only difference is that with so-called 'current feedback', the feedback signal is applied directly to the emitter of the diff. amp., viz. the voltage fed back is unbuffered..
Hi,
I suspect that the fuses are protecting the speaker from excessive DC after an output device has failed.
If I have surmised correctly, I would like the amp to shut itself off before taking out my drivers. For this reason I am thinking that faster is better.
Could the fuses be there to prevent progressive failure taking out further devices?
Or are they for short circuit protection?
There appears to be little else for protection than the usual Zeners on the Gates. This form of protection relies on very robust output devices and these IRFs probably fall into that category. Can anyone confirm?
I suspect that the fuses are protecting the speaker from excessive DC after an output device has failed.
If I have surmised correctly, I would like the amp to shut itself off before taking out my drivers. For this reason I am thinking that faster is better.
Could the fuses be there to prevent progressive failure taking out further devices?
Or are they for short circuit protection?
There appears to be little else for protection than the usual Zeners on the Gates. This form of protection relies on very robust output devices and these IRFs probably fall into that category. Can anyone confirm?
I found this thread today, and i really liked this circuit. Its smart, simple and probably very good sounding..
I want to make a simple class A amp out of it so i drew this:
I omitted the bias circuitry for clarity, and the powersupply too.
Any comments on this???
Cheers johannes.
I want to make a simple class A amp out of it so i drew this:
An externally hosted image should be here but it was not working when we last tested it.
I omitted the bias circuitry for clarity, and the powersupply too.
Any comments on this???
Cheers johannes.
JojoD818 said:
Hi JojoD
This is what has been disclosed by Greg Ball :
http://www.diyaudio.com/forums/showthread.php?postid=736240#post736240
So this SKA schematics principle is public from Greg and this is diy here...
fab said:
Hi fab,
The schematics have no values in it? I have diy'd several amps out of schematics posted from this forum before (Leach, P3A, etc.), but thanks anyway.
From AndrewT's post, intellectual property may mean the circuit is not available online and so I may need to buy a kit or something if I want to build one.
Thanks
lineup said:
lineup said:
amplifierguru said:
######################################
JojoD818 said:
JojoD818 said:
######################################
JojoD818
As you can see I asked this from amplifierguru, in January 2006 before he left diyaudio.
His answer to the great offering I gave him
was that he may consider this in future:
Maybe after the first 100 pairs I'll reconsider.
Sorry to say, as demand for SKA has been so good, as I think it has,
I doubt very much
he will give away much more of the exact circuit of SKA.
---------------------------------------------
But just we wait 1 year or 2
and somebody SKA owner may publish the full schematic here
when asking us for help to fix some problem with a SKA amp
or make some wanted custom modification redesign ....
Any amplifier secret always will be public knowledge
sooner or later, one way or another
at the audio internet community.
Sometimes we have to trust our Russian or Chinese friends
to give us good information.
Through the fully open backside door.
That's how it is ... in reality.
Be it good or bad.
And whether we like it or not, does not matter the tiniest bit.
Or does it?
lineup
Lineup Audio Amplifiers
http://lineup.awardspace.com/
.................................................................................
PS.
I have several interesting unique amplifier circuit topology solutions
that I have never seen anywhere else.
And as they work extremely well and effectively
compared to common ways used, at last in my Multisim SPICE testings,
I will also wait a bit before giving it away for free.
There is always someones out there,
ready to copy and put their own brand to a good idea
and make every single buck they can out of it.
DS.
Hi lineup,
I see that you have already asked for the schematics a long time ago. Anyway, I fully respect the idea of Intellectual Property and so shall abide by the designer's wishes. Like you said, maybe I'll just have to wait for about 3 or 5 years.
However, it has also been my hobby to diy my own boards out of the schematics our friends post here. Unfortunately, this may not presently happen for the SKA and so I'll just look for other interesting amp to satisfy my diy hungry fingers.
Cheers
I see that you have already asked for the schematics a long time ago. Anyway, I fully respect the idea of Intellectual Property and so shall abide by the designer's wishes. Like you said, maybe I'll just have to wait for about 3 or 5 years.
However, it has also been my hobby to diy my own boards out of the schematics our friends post here. Unfortunately, this may not presently happen for the SKA and so I'll just look for other interesting amp to satisfy my diy hungry fingers.
Cheers
okay
JojoD818
powerbecker, Heinz is a very clever amplifier guy.
In his Post #230 in this topic
he attached a PDF Circuit, he called SKA Guess.
It is full design with component values and is based on published simplified schematic
and what little additional info / details that amplifierguru has told in his many posts.
Below is amplifierguru comment to this powerbecker PDF circuit:
Quite close!
Now we should not blindly trust when amplifierguru tells this.
Even if a circuit suggestion would be very far from SKA
he might say like this anyway ....
Links:
PDF SKA Guess Amplifier - in PDF attachment
powerbecker Post #230 and and amplifierguru reply
lineup
JojoD818
powerbecker, Heinz is a very clever amplifier guy.
In his Post #230 in this topic
he attached a PDF Circuit, he called SKA Guess.
It is full design with component values and is based on published simplified schematic
and what little additional info / details that amplifierguru has told in his many posts.
Below is amplifierguru comment to this powerbecker PDF circuit:
Quite close!
Now we should not blindly trust when amplifierguru tells this.
Even if a circuit suggestion would be very far from SKA
he might say like this anyway ....
Links:
PDF SKA Guess Amplifier - in PDF attachment powerbecker Post #230 and and amplifierguru reply amplifierguru said:
lineup
AKSA said:
Hi Hugh,
Thanks for the heads up!
Best Regards,
JojoD
@lineup,
reading between the lines in your quoted post is exactly what's pointing me away from the SKA.
nonetheless, I believe that there are other exciting projects out there just waiting for me.
Mr. Dean already has a suggestion, see what I mean? Cheers
JojoD818 said:@lineup,
reading between the lines in your quoted post is exactly what's pointing me away from the SKA.
nonetheless, I believe that there are other exciting projects out there just waiting for me.
Mr. Dean already has a suggestion, see what I mean?
Good advice from Hugh AKSA Dean.
There are several other interesting diyaudio amps to try.
Many of them have no standard PCB layout, yet.
SymaSym is a great amplifier project.
Still there is development, refinement going on and may come another new version after some time.
It has got everything that makes a very good amplifier project.
MikeB and 'his guys' in the SymaSym topic can give 100% perfect support
when building a SymaSym.
Good luck, JojoD818
whatever next project you will build.
You will make yourself a great new amp
and I know it will not be the first time you do it.
Regards
lineup
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