This looks like a Doug Self schematic with the option to replace the follower with a cascode to help the VAS that he shows in his published designs.
The frequency extremes could both do with about one octave wider bandwidth.
I don't like Self's use of LTP mirror and Miller comp cap (Cdom) that dominate all his designs.
The frequency extremes could both do with about one octave wider bandwidth.
I don't like Self's use of LTP mirror and Miller comp cap (Cdom) that dominate all his designs.
I have redrawn the SC ULD class AB schematic, so can I post that because I believe it's the magazine that has copyright, not the actual schematic?
Absolutely.
The posted links were images and schematics, copyrighted by siliconchip and from the paid section of that site.
/Hugo
The posted links were images and schematics, copyrighted by siliconchip and from the paid section of that site.
/Hugo
Hi all,
Here is the schematic of the Silicon Chip Ultra Low Distortion class AB amp. (SCULD class AB). I hope this makes the thread a little more meaningful. 😀
Only last Saturday I had an audition of a highly modified version of this amp and was impressed to say the least. So, I not sure what the standard ones sounds like, but I can say if you know what you are doing you can get one of these to really sing.
regards
Here is the schematic of the Silicon Chip Ultra Low Distortion class AB amp. (SCULD class AB). I hope this makes the thread a little more meaningful. 😀
Only last Saturday I had an audition of a highly modified version of this amp and was impressed to say the least. So, I not sure what the standard ones sounds like, but I can say if you know what you are doing you can get one of these to really sing.
regards
Attachments
The one that Greg heard belonged to a friend who is using a CFP VAS and 30,000uF capacitance for each supply rail,plus another tweak or two..
SandyK
SandyK
I am studying and producing my own modifications into the simulator
Depending on the simulator results....awfull the original into my simulator..this one modified is a little better...but not good.
I will continue to study this one.
Maybe it will turn the next Dx amplifier... maybe i said...i have to study for weeks into the simulator and ask a lot of friends about.
Also i will ask Graham to evaluate and to simulate it.
I will ask Michael Bittner and Hugh Dean too.
And then...maybe...not sure...if positive results of conversations, maybe a prototype....... if the prototype sound fine after tweakings it is possible that i will open a thread about.
For a while.... only to give a shot on it!
The original was already smashed, destroyed and it is in the garbage can (the box may be offended!)... the original Miller modified capacitor of 100 picofarads are triangulating the wave form after 60 kilohertz!!!!!....the enormous output filter were eating the high frequencies.... the zobel loading the amplifier...and low frequency drop was enormous...people may be kidding to publish those things!...not you Qev!....the magazine!
This complicated thing is simulating worst...many times worst than the simple and cheap Dx amplifier.
regards,
Carlos
Depending on the simulator results....awfull the original into my simulator..this one modified is a little better...but not good.
I will continue to study this one.
Maybe it will turn the next Dx amplifier... maybe i said...i have to study for weeks into the simulator and ask a lot of friends about.
Also i will ask Graham to evaluate and to simulate it.
I will ask Michael Bittner and Hugh Dean too.
And then...maybe...not sure...if positive results of conversations, maybe a prototype....... if the prototype sound fine after tweakings it is possible that i will open a thread about.
For a while.... only to give a shot on it!
The original was already smashed, destroyed and it is in the garbage can (the box may be offended!)... the original Miller modified capacitor of 100 picofarads are triangulating the wave form after 60 kilohertz!!!!!....the enormous output filter were eating the high frequencies.... the zobel loading the amplifier...and low frequency drop was enormous...people may be kidding to publish those things!...not you Qev!....the magazine!
This complicated thing is simulating worst...many times worst than the simple and cheap Dx amplifier.
regards,
Carlos
Attachments
Ultra-LD100W
Carlos
The amplifier that Greg heard only has a passing resemblance to the original published design . The original design's HF response was deliberately rolled off to ensure repeatibility, without susceptibility to EMI. I raised this issue with the magazine. The original was NOT a bad sounding amplifier. I don't feel that it is helpful to rubbish the original design, or publicly attack the design's perceived shortcomings. Have you seen the full specifications of the original design , and the rest of the published article ?
I have heard Destroyer X AND the modified design that Greg refers to, but in fairness to everyone concerned, I decided not to post my findings in a forum with public access. Also , I did not want to place Greg in an untenable position.
Kind Regards
SandyK
Carlos
The amplifier that Greg heard only has a passing resemblance to the original published design . The original design's HF response was deliberately rolled off to ensure repeatibility, without susceptibility to EMI. I raised this issue with the magazine. The original was NOT a bad sounding amplifier. I don't feel that it is helpful to rubbish the original design, or publicly attack the design's perceived shortcomings. Have you seen the full specifications of the original design , and the rest of the published article ?
I have heard Destroyer X AND the modified design that Greg refers to, but in fairness to everyone concerned, I decided not to post my findings in a forum with public access. Also , I did not want to place Greg in an untenable position.
Kind Regards
SandyK
I will listen at it..... i will construct and listen.
And because i love Aussies, i will not post my findings anymore, with the exception if they were very good...rigth?
Agreement made!
regards,
Carlos
And because i love Aussies, i will not post my findings anymore, with the exception if they were very good...rigth?
Agreement made!
regards,
Carlos
Maybe hienrich, but we have also to follow our own beliefs
I think that we have not the rigth to go "burning" images of people, designers and magazines...in special when we have not readed the text to understand the ideas that made some amplifier.
We have not the rigth to do this way...to go "supervising" and evaluating everything as we are not the scientific Gods...we are more a scientific deliroids than Gods....as there are people inside our members that believe in cables dopped with dancing electrons that will make the sound musical...we believe in a lot of foolishes, and this do not make us "scientific" enougth as a group.
I receive the information that the amplifier was made that way, cutting high frequencies to obtain more stability...well...as a decision people made...not an error.....you know...more an effect that resulted from a decision that a defect caused by an error.
And...having only my simulator results, i entered in a very unfair way and i said that the schematic could go to the garbage can...in the reality i would dive into the garbage can because i was idiot!
I had only simulator results...this means nothing!....i have not listened, and this is what matters.... i had not readed the text to receive all informs related the philosophies that created the "north" to the designers...so.... i had not tools enougth to evaluate.
I have cleaned my mouth with soap and decided to be kind as i used to be.
I am sorry because i have opened my damn mouth to talk foolishes and to be agressive and unfair.
I will try not to be stupid anymore.
regards,
Carlos
I think that we have not the rigth to go "burning" images of people, designers and magazines...in special when we have not readed the text to understand the ideas that made some amplifier.
We have not the rigth to do this way...to go "supervising" and evaluating everything as we are not the scientific Gods...we are more a scientific deliroids than Gods....as there are people inside our members that believe in cables dopped with dancing electrons that will make the sound musical...we believe in a lot of foolishes, and this do not make us "scientific" enougth as a group.
I receive the information that the amplifier was made that way, cutting high frequencies to obtain more stability...well...as a decision people made...not an error.....you know...more an effect that resulted from a decision that a defect caused by an error.
And...having only my simulator results, i entered in a very unfair way and i said that the schematic could go to the garbage can...in the reality i would dive into the garbage can because i was idiot!
I had only simulator results...this means nothing!....i have not listened, and this is what matters.... i had not readed the text to receive all informs related the philosophies that created the "north" to the designers...so.... i had not tools enougth to evaluate.
I have cleaned my mouth with soap and decided to be kind as i used to be.
I am sorry because i have opened my damn mouth to talk foolishes and to be agressive and unfair.
I will try not to be stupid anymore.
regards,
Carlos
Carlos
actually i would like to know why your symm's said no but measurements said yes?
Maybe component choices and/or data?
Symm's don't tell the whole story?
Then again,
anyone done any improvements to this amp?
There must have been a few made...
allan
actually i would like to know why your symm's said no but measurements said yes?
Maybe component choices and/or data?
Symm's don't tell the whole story?
Then again,
anyone done any improvements to this amp?
There must have been a few made...
allan
Naah..... they use to make some make up into specifications.
For instance...some amplifier may be awfull into 20 Kilohertz..than they publish the data related 10 kilohertz..sometimes lower frequency...they find were that numbers are fine.
Well...i am talking too much.
We have to listen dear Aussie...the final judgement must be our ears.
Simulators are a nice tool..but cannot inform sonics.
My simulator turns slow when the amplifier is strange.... not only strange but dense and complicated...the simulator goes slow calculating a lot of things...this seems to me, that having a lot of things we gonna have also a lot of problems.
Try to send one message:
Tell John that a car crashed into a small market..that sausages flow away and one old woman had a heart attack.
Send this message to john...ask him to send the same message to Mike...and them to Herbert..and them to Tony.... also pass this message by Greg, to Hugh, to Thorton and to holton.....than..go to listen the message.
It may be that one airplane was parked into a baker place where a not so old woman was producing salted snacks that flow away when the airplane turned the engine on..one car was there, thrashed there.. abandoned...alike garbage and people told that the owner had a heart attack.
Now imagine when you have a lot of circuits..alike very symetrical amplifiers...many stages...think about the krell for instance.... imagine audio as a message going into the circuit.... hummmm.... will go out very different.
regards,
Carlos
For instance...some amplifier may be awfull into 20 Kilohertz..than they publish the data related 10 kilohertz..sometimes lower frequency...they find were that numbers are fine.
Well...i am talking too much.
We have to listen dear Aussie...the final judgement must be our ears.
Simulators are a nice tool..but cannot inform sonics.
My simulator turns slow when the amplifier is strange.... not only strange but dense and complicated...the simulator goes slow calculating a lot of things...this seems to me, that having a lot of things we gonna have also a lot of problems.
Try to send one message:
Tell John that a car crashed into a small market..that sausages flow away and one old woman had a heart attack.
Send this message to john...ask him to send the same message to Mike...and them to Herbert..and them to Tony.... also pass this message by Greg, to Hugh, to Thorton and to holton.....than..go to listen the message.
It may be that one airplane was parked into a baker place where a not so old woman was producing salted snacks that flow away when the airplane turned the engine on..one car was there, thrashed there.. abandoned...alike garbage and people told that the owner had a heart attack.
Now imagine when you have a lot of circuits..alike very symetrical amplifiers...many stages...think about the krell for instance.... imagine audio as a message going into the circuit.... hummmm.... will go out very different.
regards,
Carlos
Carlos
I have a commercial 6 channel amp rated at 85 watts per channel....
if you look closer it's 85watts single channel driven!
two front channels are more like 40Watt.
and this is a marantz!
allan
I have a commercial 6 channel amp rated at 85 watts per channel....
if you look closer it's 85watts single channel driven!
two front channels are more like 40Watt.
and this is a marantz!
allan
Yes...this is normal...we have to study those data
Nothing strange on those things.
I want to have that magazine pages... i would like to read to understand the idea that was the base for this design.
I will search into my Aussies friends to manage to have this text into my mail box.
If this was legal, of course.... well...i have nothing to worry...my aussies friends will not make anything bad i think.
In such way, that schematic remembered me Doctor Self schematics...maybe inspired.
regards,
Carlos
Nothing strange on those things.
I want to have that magazine pages... i would like to read to understand the idea that was the base for this design.
I will search into my Aussies friends to manage to have this text into my mail box.
If this was legal, of course.... well...i have nothing to worry...my aussies friends will not make anything bad i think.
In such way, that schematic remembered me Doctor Self schematics...maybe inspired.
regards,
Carlos
I have made an spide assembly...will not show that awfull thing
The amplifier sounded excelent....beated my Dx amplifier.
And i will start to tweak it.
Was designed to be stable, not to produce problem to constructors.
They had that care.
It promisses to be excelent...i will see that soon.
When more pretty construction was finished..i will show you..relax!
regards,
Carlos
The amplifier sounded excelent....beated my Dx amplifier.
And i will start to tweak it.
Was designed to be stable, not to produce problem to constructors.
They had that care.
It promisses to be excelent...i will see that soon.
When more pretty construction was finished..i will show you..relax!
regards,
Carlos
I will delay a little to finally listen my modified version.
Modified to accept lower loads impedance only..the output is different.
I am also doing the SAE.....so...i am a little busy finishing other 3 Dx boards.
Maybe i will delay....the original schematic is ready and sounding onto spider construction.... sounds fine..... i will see my modified version if can sound fine or not.
Maybe i will delay a couple of days because i will have to go to Movies and Shopping with my girls...maybe Sunday nigth or monday i will be able to show you some better image.
Will not say any bad points....only the qualities...this way is better...as bad points can be design decisions thinking in reliability, stability...those things needed when a lot of dummies, alike me, will construct their schematics.
regards,
Carlos
Modified to accept lower loads impedance only..the output is different.
I am also doing the SAE.....so...i am a little busy finishing other 3 Dx boards.
Maybe i will delay....the original schematic is ready and sounding onto spider construction.... sounds fine..... i will see my modified version if can sound fine or not.
Maybe i will delay a couple of days because i will have to go to Movies and Shopping with my girls...maybe Sunday nigth or monday i will be able to show you some better image.
Will not say any bad points....only the qualities...this way is better...as bad points can be design decisions thinking in reliability, stability...those things needed when a lot of dummies, alike me, will construct their schematics.
regards,
Carlos
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