Destroyer x Amplifier...Dx amp...my amplifier

[sparkle]

well Jacco,
You know how hot country Brazil can be......i know Carlos and we do not have to worry that Carlos will become to hot to explode... he is a nice guy that has to much worries on his had and has witnessed many of his friends go crazy and go from the forum - that is probably the reason he is spitting fire on everything he might think that is against him.... in reallity he is a good guy that is allways ready to help - i know him for more than 2 years now and he was sometimes angry at me but only short time when we started to talk privatelly via mail...after that he never raised his voice on me - he only don't know all the people and is cautious....well....

hope this will help

[destroyer X]

It is good the smaller supply...small power may be interesting as Sparkle said.

But depends on you...imagine that someone loves to operate the amplifier with something alike 35 watts of power...let's imagine that the speaker works better in this power range.

When using the smaller supply voltage.... the amplifier using that supply will be operating over (above, higher than) half power...much more near the distortion levels than the bigger voltage amplifier.

I want to say, that the bigger one will distort less, probable, compared with the smaller voltage supply... considering 17 volts output for instance.....my imagination., not entirelly sure..correct me if i am wrong.

But if you listen at really low levels....the smaller supply will be the perfect one...depends on you..the way you use to listen music.

I understood that 25 supply is 25VAC...so...it will result in 35 DC (more or less calculators...aproximattelly...around that...near that)

And the other one..with 35 VAC will result in 49 DC (around that calculators)
.................................................. ..................................................
Dear Jacco

Life is a big theater..we are all "on stage"

regards,

Carlos

[sparkle]

Carlos
- you are making a hard one for Vurguuz..... tell him how much power he will have with his 2*25V/4A AC transformer and how much he will have with another one and also if he needs to use one or two transofrmers.....pleaseeee

[destroyer X]

Using the bigger supply..this one with 35 volts x 2

Your output power will be 188 Watts Rms over 4 ohms
94 Watts Rms over 8 ohms

R14 will be 220 ohms and bias trimpot in the middle range.

Vr1 will have adjustment around 7700 ohms

R10 will be 1K8

Current will be 34 miliamps ...the output will hold a very small current...something near 10 miliamps (you can adjust)
.................................................. ...............................................

The other transformer...that one with 25 volts x 2

Your output power will be 98 Watts RMS over 4 ohms
49 watts RMS over 8 ohms

R14 will be 330 ohms..and bias trimpot will be adjusted to 82 ohms

VR1 will have adjustment around 8000 ohms to correct the off set.

R10 will be 2400 ohms (to match 750 milivolts in the input)
output current was adjusted to 100 miliamps. (you can adjust)

Sparkle..you are an enginner..you can inform those things in my place and you also can re-check my calculations...as i am not so good related calculations (I do not apreciate...i prefer to listen...that part is the hard one for me)

Sorry...i was very complicated....all he wants to know are the above informs....but observe the transformer power...i think he will need more than one.

regards,

Carlos

[sparkle]

oh no, no, no ....
i only want to help - not to have somebodies else feather...... you are a good friend and i don't want to steal your thread.....
only suggest this and that if i can....

in my opinion that transformer that has 2*25V would be much better choice for the amplifier.... nice power, nice size of the transformer....you can use one of them - or even better you can use two of those 2*25V - one for each channel and also separate each power supply for each channel if You can Vurguuz...
if You can't than use one power supply and one transoformer - it would be o.k. too....no problem.....

edit : well one may be sufficient but hard on the edge .... two will be much, much better ..... oh, it would look nice - everything separated - 2 transformers, 2 bridges, 2 filterings, 2 channels.....well if he can do that of course....


hmm.... now that i look at it ....it is only 200VA transformer... it will be hard on the edge for two channels.....better to use 2 transformers - each one for one channel....

[destroyer X]

happened with Graham Maynard...and this turns me nervous.

Forum is free....too much in my point of view.

The police we have do not want to be police.

You can enter without give informations about you...so..if you are
very frustrated in you life...a good idea may be enter as Spitfire and go creating mess.

I think the forum "dark side" will be more interesting..as you can select the annoying ones and give them what they deserve..bad times...beeing "with the force".... the ligth side..you will be target.

And it is easy.... try to teach Nelson Pass to design class A amplifiers!...he may not answer you.... and will be hot inside for sure.... in the Nelson Pass position..if i was there, in his position, beeing bothered and no one entered to block the thread..a finger...a finger!...will be pointed to the damned annoying guy...ahahahahah...a finger...pointed.

Nelson Pass, for instance..he is not the same as we are..personally i do not love him, as he snobbed JLH once and i am hot with him since that day...but i can perceive how good he is, how important he is....he is not the same as me and others...much more important...and i think ican be bothered by some idiots...but he cannot!.... why?.... is he better than me?

- "YES! he is much better than i am"

It is not fair to judge him the same as others... a very cooperative man..one of the main extructures of knowledge and experience in our forum....he must be protected against annoying people much more than the others simple ones...the non contribution ones.... well..each one of us with our own point of view.

I think you can call me idiot...but do not try to call Mr. Bush....even if you are rigth... you cannot...try to do it to see the result.

So...in my real point of view...the advantage is with those folks that wants to create confusion i think.

We have to respect other guys...and there are annoying ones that are hard to respect....but those annoying ones, beeing clever, they can transform the forum in a hell place.

I will tell you once more...Graham is a scientist...not a common mortal....a researcher.... very old with his head filled with experience...and them appeared TLF....well...you know what happened.

So...this is what i believe (strongly) that will be my destiny , because i use to cooperate and this exposes me..and to feel bad with forum already happened with many folks.... a lot of good people already gone.

I do think that you cannot evaluate everyone the same grade...i cannot polish Graham shoes...he is more important for this forum than i am...also Nelson Pass is important..very important..and to create the same level for all folks and those guys is not fair..or at least not too much intelligent...as no one is missing TLF9999..but for sure Graham is beeing missed.

the amplifier i have posted was already designed, criticised, calculated, simulated, constructed, listened, compared, evaluated and it is almost ready..it is not for re-design anymore.

Constructors wanted...and them a review....honest evaluation..and ready.... my contribution will finally will be finished.

Having an honest constructor..for sure he will apreciate and will aprove.

regards,

Carlos

[destroyer X]

Those separated ones are pretty.

Also you will have better separation

The sound stage will appear much more clear with those ones.

And the obvious dinamic advantages...if left channel sucks enormous energy from its supply..voltage will be reduced by power consumption..but nothing will be transfered to the rigth channel...alike independent suspensions in automobiles.

Separated transformers..separated rectifiers and separated electrolític condenser for filtering.... all independent.

regards,

Carlos

[destroyer X]

Mr. Greg, a good friend and a very cooperative man, is trying to keep the amplifier schematic updated.

In the reality the circuit show is excelent.

But i have made modifications...small increase in sonics...really very small one...so small that i have to remove and install once again to have sure...in the moment i have only one Dx board working...so i cannot compare instantaneously two Dx circuits.

The amplifier is playing full time and i made some small things:

C1 was increase to 10 uf....more power into bass deep end only...increase in quality was small.

I have removed R1.... Graham suggested that...and really the treble had some increase...checked...this worked!

I have increase C3 and C7 to 1000 or bigger...humm... the sound seems to result more dense...but i am not sure.

I have increase C10 to 1000uF.... bass turns better...clearly.

Normally those things happens because of Graham..as he know that if something cannot be clearly perceived in sonics that i will banish the modification and will not even try.


Carlos

[jacco vermeulen]

Carlos,

for nearly a year now i've got a constant beep in my head and frequent headaches, after having my head pulled by a certified chiropractician to cure shoulder pains in 2006.
I'm not in the position to blame anyone, as i've injuced severe bodily harm to more (in the past) than Mike Tyson. Less than 6 months ago i broke some fingers, the result of deciding to hit a metal lamp post instead of a face. If i keep this up i won't have any knuckles on my hands in a year from now.
=> www.gmweb1.net

Learn, by not following the example of others.

[destroyer X]

But he is too old to change his mind.

He will not come to us again...and i feel that he is not wrong.

regards,

Carlos