This amplifier is distorting high frequency, some audio compression too. Know why?

[MikeB]

27 ? You are very busy...
Okay, will post my amp this evening !

Mike

[destroyer X]

The place you post it.

Want to see.......i think you already showed us....tell me.

langsam? slow?

You do not believe...hehe...good mood.

regards,

Carlos

[MikeB]

Hi carlos !

No, i haven't posted this one yet, but i do now...

It's a "simple" straight complementary design, using my standard
tripledarlingtonout, simple bjt-diffamp and cascoded vas. You can
replace the 3 diodes by a green led (matched upper/lower).
I think it sounds very nice, it has a warm but detailed sound,
thd at 20khz is ~0.003%. Openloopbw is about -3db@33khz,
openloopgain 1:5000.

Mike

[destroyer X]

Will show brigth treble, undistorted and will appear surprising the one will be hearing... some small noise from speaker in close distance (bull S---) as this do not mind.

I could understand, and i like this schematic, i love the simetric stages, but i am a little afraid of the connection i called (floating) when emitter are not referenced to the output....i could see that the deep bass is "erased" by this use...but, the other side is clarity of treble, the detail and you are using some "focusing" capacitor that is very good.

Also could not see the "triangulator" Miller cap....you are using a feedback to avoid oscilations...tuned to hi frequency....this erases hi harmonics too.

Please Mike, i am very happy to receive this schematic, as all forum friends may be too, but i will be happy to hear if you perceived some lack of deep bass?

About the piano.....i suppose it is heard as we entered inside the piano....very real isnt' it?

More than 4K amplifiers made, can give me some idea...and i use to be rigth in 30 percent of the things i expect.

Was a good surprise the Graham circuit....i was thinking no good.... till i assemble and could feel the sound.... zier gut, very good.

But Graham writes too complicated to me to understand... the damned is some kind of gênius...hard to follow him.

Mike, i will be happy to see a picture of your assemble. and this is for safe reasons that i will let you know as soon as you sent me the picture, and the bass question i made.

I thank you very much, and i must confess that your amplifier will be constructed earlier.

Will not publish results...except if you beat AKSA, Graham JLH or the JLH designs.

Your power is a problem to comparison using my friends... when reducing power to compare they say that it is not fair, as your amplifier will be out of the class A region, when others will be running class A...... part of the time of course.... dinamics turns all to AB...but the detail, the pianissimo level will be compared.

Well, i will put more crazy schematics, of bad amplifiers, as when i do that, always someone sent me some schematic.... but not with your courage, they send in secret...hehe.

I could detect one guy lazy....made me nervous with him....i told nothing to him....just finished conversations.

He found one schematic, and had interest to have informs of it without the work of assemble...this way sent it to me, to make my person one "assembler"..... when i asked the picture...hehe, not picture.

Not fair, every crazy schematic, to check if will work or not, tell me that works and send me as a tested unit.... and "using" my time and my "assembler" person.

Have some components burned here, i will scan other day.... burned when trying some crazy schematics....bad designs...and also my own mistakes that had destroyed a lot of parts....now a days i do not colect burned parts anymore.... i send them to hell!...using a gun shot.

Here, is forbiden....can not use fire weapons....only the bandits...new stupid law, inverted related our needs. Government asked and paid between 40 and 120 dollares for your weapon... to avoid violence....but now, only the bandits have guns.... and the other bandits we have, the police, have guns too!!!...if some neighboor tell police...i will lost my gun and will be arrested for 3 years.....hehe..... 30 minutes till they discover i am one of the President, second degree cousin....ahahahaha

regards,

Carlos

[Workhorse]

Hi CARLOS SIMPly tell us which type of power fets are available at ur place .
We want to give u a schematic of an N-channel Mosfet amp.

With Regards
WORKHORSE TCHNOLOGIES

[Upupa Epops]

Carlos, schematic which was sended to you by Mike is realy modern and I mean that will have excelent sonic parameters . You can't understand to all, but when you build it ( correctly ), you will. Mike, I hope, that your PCB is the same nice like schematic. Or may I help you ?

[thanh]

Originally posted by destroyer X
My special friend Thanh.....my dear...hehe....my old fellow...ahahaha....

Who is that lady?

My God!

Incredible!

Magnificent!


Astounding!


Who needs an amplifier if can look that beauty everyday.....thanh!!!....WHAT A LUCKY GUY YOU ARE!!!!!!!!!

Remenber poor devil charlie......little charlie....lonely...... has she one sister.

If you daughter or wife....hehe...I AM OUT...MOVED FROM THE ADRESS.....GOING TO MARS!!!

Carlos

carlos!cảm õn nhe! She is Chaerim .I love her forever
http://www.koreanwiz.org/at/actors2.html She have just married
I cried like rains
à!carlos ! I'm sorry .I like the sound of JVC television not sony

[thanh]

I'm using symmetry amp .In the sim,THD is very terrible but it is quite hifi and annoying so I still love zero THD

[MikeB]

Hi upupa !

PCB ? Oops, i only have prototype on testboard...
The sonics are really not bad, but i can't determine real quality,
i am biased... Stabilizing the amp with these "zero poles" was fun,
it was incredible how big audible difference was compared to normal
stabilizing. Even more fascinating, with this amp you can easily show
how important linear openloopbandwidth is. By removing the 100k's
in vas you get linear decreasing ol-bandwidth starting at 100hz.
Directly comparing the sound shows that without these 100ks, the
sound get's slightly too bright (Not annoying, but audible).

Hi carlos !

The pic of my other prototype was taken with borrowed digicam, so
will take some time to prove that i do not misuse you for testing my
circuit, beeing too lazy to try it myself.
I wanted to misuse you for checking if i am too biased, or if the amp
is really good !

I intentionally avoided millercaps, i use RC's for compensating. This
gives very "smooth" AC-sweep, having no "spikes" at all.
I am not sure what you mean with "emitter not referenced to output",
it's a emitterfollower ?
I can assure you, the amp has painful deep tight bass !
It has a very clear sound, but is not bright at all.

Ah i forgot, the 1090ohm in the biasing is in my prototype a 500ohm
plus 1k-trimpot. I adjusted Iq to ~100ma.

Mike

[MikeB]

Hi carlos !

Here's a picture from my assembly. Sorry for the poor quality, had
to use videocamera...
In prototype the 1000uF are missing, had not enough place left.
Everything else is identical to schematic (except fuses)

Mike