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Old 30th April 2007, 07:27 PM   #1081
Nordic is offline Nordic  South Africa
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Lol no carlos, you missunderstand... Graham said that he connects a 9V battery over power rails, to just check that nothing smokes, or gets warmer thatn it should... we don't need to make the amp for 9V...

I use the lightbulbs to limit current at either about 250mA or 400mA depending on which bulb...if it doesn't light up, all is fine and you can remove the lightbulb.... it acts like variac almost...


Allthough I would like to see a lower power version somewhere along the line as a tweeter driver... for biamping...
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Old 30th April 2007, 07:53 PM   #1082
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Default hehe...i was kidding..but at least dear Graham could make a simetrical 9 Volts supply

using two batteries....ahahahhaha

Will last long.... 5 microseconds!

regards,

Carlos
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Old 30th April 2007, 08:10 PM   #1083
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yeess...design something new is a hell problem....when so much design are allready published and when i see that from one design i allready like i have at least 4 amps that are so well made (Aksa, DX, GEM, Lifeforce - not particulary in that order) that it is like playing with giants .....it is a problem - not to duplicate but also make something good...because every change might degrade the sonics....which will probably happen in my amp that i am considering to make...just for playing arround (because i have Lifeforce at my home that is playing music so good (>>music<< my friends) that i really do not need another amplifier...
GEM is very interesting amp - because how it is made (concept of A and AB class in one amp) and DX is so simple and so well thought about that i am almost freekin' out of my mind...so simple and so good....marvelous....

really - who am i to get even near to you guys....so i will do my amp only for playing arround...to see what i will come out with.....
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Old 30th April 2007, 09:13 PM   #1084
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Default Maybe to try rail to rail swing alike Workhorse have made


Sparkle

We can try to create a method to rail to rail swing (less saturatiion voltages).... not to copy Workhorse...ahahaha..i did not could even understand how his amplifier is working...try to imagine the copy results..ahahaha...maybe he do not know too..i have asked him explanations and....hehe...silence.

We can try some bigger gain in VAS...double simetrical input, having two complementary VAS....there are things to explore.

Also some dinamic expansion...we can arrange a positive voltage regulation for a supply...having high current drain, the output voltage can raise to create more dinamic punch...hehe...interesting things may come from you Sparkle.

A very fast AGC to the input...referenced by output AC voltage or DC detection (start of clipping).... a never distorting amplifier...always under 0.1%.

Have you observed the Linx, from Dupont?... that input...Vas capturing signal from op amp rails?... and the rest of the amplifier with our own ideas?

You are a promisse..... i will be cooperating with you to see your amplifier born.

I will dive deep inside this brain storm with you..till the limit when the brown fluid start to scape from our heads...too much ideas, is considered in my place that people had some contamination inside the brain...ahahaha...brown fluid is terrible!

As i have started to tell you..when i decided to make mine one...i have made a Frankstein.... the head came from Aksa... the legs from GEM... something i have stole from Symassym.... the amplifier was so pretty...ahahaha..and sounded so awfull!!!..than i started everything again..based in King's topologie...Hugh Bootstrapp... and them resulted very nice...very very nice!

hehe...fine....very good....people with ideas...lovely crazy folks....maybe with some fluid leakage... and some parts to test here too.

Can i help you, a co-production on the Koncept one?

regards,

Carlos
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Old 1st May 2007, 05:49 AM   #1085
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koncept 1 is only the first full schematic i made - not the name for the amplifier
i will try to find Linx ...and that amp from workhorse ...on diyaudio forum - we will be talking about it...
thanks
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Old 1st May 2007, 07:01 AM   #1086
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Quote:
Originally posted by sparkle
and that amp from workhorse ...thanks
http://www.diyaudio.com/forums/attac...amp=1142507100
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Old 1st May 2007, 07:35 AM   #1087
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Hi Nordic you suggested a lower power DX for treble.

Carlos, can I suggest you look at making say a 20W class-A DX which may be used for bamping at 500Hz upwards only, say to combine with a standard 100W class-AB for bass.

When you bi-amp it is the sound of the upper frequency amplifier which controls perception. Indeed, the lower frequency amplifier can be quite inferior compared to the mid/upper amp and you would not notice unless it is actually poor. This means that the system can run even louder ( or at the same level with increased quality ) because the bass channel can run very close to clipping without the rest being affected at all.

This is hard to describe, but as soon as anyone hears it the improvement is instantly recognisable.

Also with a class-A Dx, it might be possible to back off the value of the Miller connected C.dom a little, and thus further improve fidelity.

Class-A and class-AB combined in one system would produce much more controlled sound than two class-AB. Indeed, many years ago Douglas Self introduced an amplifier which had a switchable bias setting for A - AB operation. Also the topology you use in the Dx will run into class-AB beyond say 20W of class-A on the standard amplifier anyway though there would be much more standing heat if the standard one was biased to this level.

If I remember rightly you tried higher bias levels on the class-AB amplifier and this reduced fidelity, but a purposefully optimised Dx for class-A should not suffer this effect.

Cheers ......... Graham.
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Old 1st May 2007, 08:49 AM   #1088
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Default I feel myself very atracted about you have suggested Graham


But i think, also, that the thread will be extremelly confused...and hard to give a good follow up...to be over the shoulder related all constructors.

There are those ones that tell people that is constructing, and others that do not want people to know..

This produces a lot of work and i think it will better to multiply threads with different ideas.... with complementary ideas...beeing Dx amplifier or even other schematics.

You were invited, dear Graham, to design the Powerholic version of Dx amplifier..... also you are invited to hold the responsability about a Mid range unit....but i will need you tracking and answer all people's needs about those versions... a new thread may be more interesting to avoid confusions.

I have to produce some resistance...to avoid loose the North related the ideas that produced Dx amplifier.

We can see many Symassym amplifiers...and some of them have modifications not so good related Michael's mind..... so.... will be loosing the character...maybe going out of the track related his philosophie...and this was very easy as he gave the Eagle files.

People has that tendence to make modifications...i have that ideas too...we all have that mind...but.... the amplifier finish loosing the characteristic that produced the direction, the North, related the "character"..... Dx is simple, cheap and with a very nice sonics......many Dxs may not fit those characteristics.

Better to multiply..not to divide...to have more threads, more people thinking and cooperating...producing their own ideas with their own names and responsabilities....the result, obtained to Symassym thread is something i am not dreaming.... a nigthmare ...has also a thread to fix problems...the sequels.....aaagh!

regards,

Carlos
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Old 1st May 2007, 08:58 AM   #1089
Nordic is offline Nordic  South Africa
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Build it and they will come, Uncle Charlie, we'll just put it on Greg's website ... nudge, nudge, wink, wink!
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Old 1st May 2007, 09:04 AM   #1090
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Default hehe....i will go to the dictionaire once again


Man!...my native language is Portuguese...and you with those different words...not common words...grumpf for you.

hehe

I have to write those words not to forget and find translations

Wink?..tinky winky?...that one!...hehe...was a scandalous here!...

The other meaning may be to push gentle....use "push gentle" man!

grrrrrrr.

Carlos
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