GRollins said:
I agree
Manu
PS Why splitting? I would like to see this thread reaching 1000000 views. its easy to remember where the 2.0 started.
Ian Macmillan said:
Use anything that makes you happy. It's a sliding scale with push-pull at one end and single-ended at the other. Where you settle between those two extremes is up to you.
I'd suggest 1A for the current source as a starting point, although there's nothing magical about that figure. Feel free to adjust up or down according to the phase of the moon or your mood.
Use a knob. Think of it as a kind of tone control that adjusts the ratio between 2nd and 3rd harmonic.
Grey
Olivia
(my daughter is sitting on my lap--she wanted to type her name)
Grey
(she typed that one, too)
I agree too
It can be done in different ways.
Perhaps a ugs3 clone as front end. I think this is no more in production.
Macka, how do you calculate the peak classA current in a PP-design with a CCS bridged negative half.
Is the output peak current double the N-fet bias current or double the P-fet bias current + CCS. In my example in the last post the N-fets were biased with 3A, P-fets with 1A and CCS with 2A.
Is that 6A or 4A peak classA?
With 4A it is 64W RMS at 8Ohm (with high enough supply voltage 128W RMS at 16Ohm....)
With 6A it is 144W RMS at 8Ohm....
...or am I wrong???
Greatings
Dirk
It can be done in different ways.
Perhaps a ugs3 clone as front end. I think this is no more in production.
Macka, how do you calculate the peak classA current in a PP-design with a CCS bridged negative half.
Is the output peak current double the N-fet bias current or double the P-fet bias current + CCS. In my example in the last post the N-fets were biased with 3A, P-fets with 1A and CCS with 2A.
Is that 6A or 4A peak classA?
With 4A it is 64W RMS at 8Ohm (with high enough supply voltage 128W RMS at 16Ohm....)
With 6A it is 144W RMS at 8Ohm....
...or am I wrong???
Greatings
Dirk
GRollins said:
Just to show people are following this; I am. Although the discussion is still out of my league.
After building an Aleph 5, and an Aleph P1.7 I have been studying the V1.0 on and off for the last 10 months, and (I think) I now know why it works. I'm slowly building the best Aleph V1 I can right now, with new PCB's and all.
Still, It's nice to follow the V2 development.
Keep up the good work!
Harry
I still think someone with more time than sense should try an Aleph current source in place of a fixed one.
I'm not volunteering. I have neither time nor sense.
Grey
I'm not volunteering. I have neither time nor sense.
Grey
noisefree said:
You better go down on your knees and ask permission from the other Grey geezer first.
Wish there was someone sitting on my lap, but it's all me.
Why it is all jive talk(me too again)
Dirk,
All I did was work out the bias in each state (SE & PP)
Have a read of the Borberly class A module article.
Regards the actual working design I think only simulation and a working prototype can answer your question.
I would suggest that will also answer a lot of other questions.
When my down under A Aleph is running in a few weeks I might make a mini AX.5 for grins😉
All I did was work out the bias in each state (SE & PP)
Have a read of the Borberly class A module article.
Regards the actual working design I think only simulation and a working prototype can answer your question.
I would suggest that will also answer a lot of other questions.
When my down under A Aleph is running in a few weeks I might make a mini AX.5 for grins😉
jacco vermeulen said:
Don't matter to me what front end you use. I'm made a number of posts recently to that effect. I've got a UGS-ish circuit, but there's nothing sacred about mine. Doesn't even have to be a "UGS" at all.
As for girls on my lap...my daughter is four. Kinda takes the pizazz out of it. It's fun, but not in the same way as having Jessica Alba in your lap. That's a whole 'nother ball game.
(Er...did I say that?)
Grey
Thanks macka for your reply,
...will look at it the next time
Sorry Grey I hope that I was not disrespectfully to you.
I'm wondering why jacco has said that I should ask you for permission?
When it is so, please tell me.
I thought an original UGS3 is done by Nelson (or Wayne?)
My conclusion was to use a clone (which is not really a clone because a different circuit is not the original) and there are perhaps endless possibilities building it.
But I think my favorite will be the original.
Also I said that this modul is no more in production (or is it??? only UGS4 +5 in production!!??) with a little bit hope that Nelson will post it.............sometime!
I think I'm having it but I'm curious to know!
O.K. I have to end - it is 5 o'clock in the morning....
need some sleep like my sweetheart beside the laptop...
Good evening America!!!
Dirk
...will look at it the next time
Sorry Grey I hope that I was not disrespectfully to you.
I'm wondering why jacco has said that I should ask you for permission?
When it is so, please tell me.
I thought an original UGS3 is done by Nelson (or Wayne?)
My conclusion was to use a clone (which is not really a clone because a different circuit is not the original) and there are perhaps endless possibilities building it.
But I think my favorite will be the original.
Also I said that this modul is no more in production (or is it??? only UGS4 +5 in production!!??) with a little bit hope that Nelson will post it.............sometime!
I think I'm having it but I'm curious to know!
O.K. I have to end - it is 5 o'clock in the morning....
need some sleep like my sweetheart beside the laptop...
Good evening America!!!
Dirk
For years I have told people that every hair on my body is a Grey hair. Given that I have only a very few hairs that are actually gray (well, okay, if you want to get picky they're more silver than gray), this usually provokes a perplexed look...followed by the inevitable eye-roll as they realize what I've said. Groans frequently accompany the eyes.
In years to come this will cease to work, but I've made it to within spittin' distance of 50 with the vast majority of my hair being brown, so I guess I'm in pretty good shape as far as hair goes.
Oh, and it's still there, too. Hair lines on both sides of my family tend to recede a bit at the temples, then stop. All seems stable on that front.
Geezer is a frame of mind. When I was a kid, I thought anyone over mid-twenties was positively ancient. When I got to my twenties, I figured that anyone in their seventies or eighties must be getting pretty far along. Nowadays, I read about these people who die at age 116 or so and think, "You know, they had a pretty good run." It's all a matter of perspective.
I regard every birthday as a milestone. I've already outlived my father and am catching up with my mother.
Like the Little Engine That Could...I think I can, I think I can, I think I can...
Just keep chuggin', body.
And miles to go before I sleep, and miles to go before I sleep...
Grey
In years to come this will cease to work, but I've made it to within spittin' distance of 50 with the vast majority of my hair being brown, so I guess I'm in pretty good shape as far as hair goes.
Oh, and it's still there, too. Hair lines on both sides of my family tend to recede a bit at the temples, then stop. All seems stable on that front.
Geezer is a frame of mind. When I was a kid, I thought anyone over mid-twenties was positively ancient. When I got to my twenties, I figured that anyone in their seventies or eighties must be getting pretty far along. Nowadays, I read about these people who die at age 116 or so and think, "You know, they had a pretty good run." It's all a matter of perspective.
I regard every birthday as a milestone. I've already outlived my father and am catching up with my mother.
Like the Little Engine That Could...I think I can, I think I can, I think I can...
Just keep chuggin', body.
And miles to go before I sleep, and miles to go before I sleep...
Grey
Hello
I've drawn down the idea of an AlephCS in parallel to the p-output followers.
Is it possible to build that, or are there some principle things done wrong?
(resolution is horrible, I can't do it better with 100kb)
At the moment I'm trying to understand how to handle the Aleph-CS in such a position. I have a problem to calculate and manage the ratio between the max. neg. current swing of the CS and the hole max. neg. output current???
Dirk
I've drawn down the idea of an AlephCS in parallel to the p-output followers.
Is it possible to build that, or are there some principle things done wrong?
(resolution is horrible, I can't do it better with 100kb)
At the moment I'm trying to understand how to handle the Aleph-CS in such a position. I have a problem to calculate and manage the ratio between the max. neg. current swing of the CS and the hole max. neg. output current???
Dirk
Attachments
Can't read it.
Anyway this seems to have died a premature death....from lack of momentum.
Look out for some 2SK389's and 2SJ109s over at the market place.
Anyway this seems to have died a premature death....from lack of momentum.
Look out for some 2SK389's and 2SJ109s over at the market place.
hi macka,
thank's for your reply. I've chaged the resolution and boost up a bit the size of the font.
It should be readable now.
I know the fortune of the dual-jfets. But there are also single jfets which can be used. A lot of this projects here need some in the front end.
At the moment I am a bit confused which I should do first. It seems to me that the favorit amp out there is the F4. I've published a question to it in the F4 thread with no answer at this moment. Hoppefully that somebody will answer to it - wanna find out which is the better topology.
Also I came to no conclusion, if this published circuit could work.
greetings
Dirk
thank's for your reply. I've chaged the resolution and boost up a bit the size of the font.
It should be readable now.
I know the fortune of the dual-jfets. But there are also single jfets which can be used. A lot of this projects here need some in the front end.
At the moment I am a bit confused which I should do first. It seems to me that the favorit amp out there is the F4. I've published a question to it in the F4 thread with no answer at this moment. Hoppefully that somebody will answer to it - wanna find out which is the better topology.
Also I came to no conclusion, if this published circuit could work.
greetings
Dirk
Attachments
macka said:
Not really lack of momentum just other things to do. I've made some important decisions on how I will be building my prototype and when I have enough to share I will post some more schematics. Also need to order some parts before I can begin the really interesting bit.
Ian.
Ian,
I was not necessarily referring to you.
In comparison to the previous X Aleph release there is a distinct lack of dialogue and outcome among members...despite perhaps a lot of thought.
I also sense there is still a lack of certainty about what a AX.5 design is about.
I was not necessarily referring to you.
In comparison to the previous X Aleph release there is a distinct lack of dialogue and outcome among members...despite perhaps a lot of thought.
I also sense there is still a lack of certainty about what a AX.5 design is about.
I agree that people are waiting to see how it turns out and perhaps to see if the thing works in practice.
In terms of certainty about what the AX.5 is all about - does it really matter? I'm of the view that most people built the Aleph-X because they thought that NP was onto something special. Now that the Master has apparently improved it in the shape of the AX.5 - don't we want to do likewise? I think we are close enough in terms of an idea to build something and see for ourselves and that is what I plan on doing although it may take me some time. Then we can experiment with some of the variables and see what we think in terms of how it sounds. I'm looking forward to the journey...
Of course if others want to join in the experiment, that would be better still.
Ian.
In terms of certainty about what the AX.5 is all about - does it really matter? I'm of the view that most people built the Aleph-X because they thought that NP was onto something special. Now that the Master has apparently improved it in the shape of the AX.5 - don't we want to do likewise? I think we are close enough in terms of an idea to build something and see for ourselves and that is what I plan on doing although it may take me some time. Then we can experiment with some of the variables and see what we think in terms of how it sounds. I'm looking forward to the journey...
Of course if others want to join in the experiment, that would be better still.
Ian.
It took me about four or five months to go from conceptual schematic to working prototype. Had I proceeded in a straight line I could have moved more quickly, but I explored a bunch of variations along the way. Of course, it would also have gone more quickly if I hadn't had sundry interruptions like work and the inevitable home repairs. I tried to get in thirty minutes or so per night after I got home from work, but didn't always manage. Take your time.
Grey
Grey
Hi Ian M.
When you have what you feel is a workable solution, I'm interested in fabricating a prototype... 🙂
I can't remember; did you develop a BOM?
When you have what you feel is a workable solution, I'm interested in fabricating a prototype... 🙂
I can't remember; did you develop a BOM?
No BOM yet but I can produce one if it helps. There are still a few details to work out but mainly these relate to the PS and in particular the regulation for the front end. I was also planning on making sure I haven't needlessly specified parts that are hard to obtain.
Ian.
Ian.