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The AMNESIS amp: a good amplifier, like a gentleman, has no memory.
The AMNESIS amp: a good amplifier, like a gentleman, has no memory.
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Old 12th June 2018, 05:23 PM   #111
maxlorenz is offline maxlorenz  Chile
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Quote:
Originally Posted by R Dijk View Post
IC that ya haw a circ that is modded a copple of times.
Dont ya get sort of exitet by the thougt of having bouth sides of the vas stage to bee active or sort of ? Maybee even symmetric?
I dear. Thanks for your interest.

I have two projects in one so to speak: the real amp is the circuit posted above with bootstrapped VAS. The other amps are only in .asc simulation format and those have active CCS VAS. Many variations have been tested.

The biasing I posted latelly is a modified Hagerman: it could a a diode or a transistor in diode config. It is supposed to be much lineal than the classical.

Be aware that I am no expert and that I progress giving "blind sticks" here and there, trial and error...until I catch the attention of the big dogs.
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Old 12th June 2018, 06:16 PM   #112
R Dijk is offline R Dijk  Norway
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Quote:
Originally Posted by maxlorenz View Post
I dear. Thanks for your interest.

Be aware that I am no expert and that I progress giving "blind sticks" here and there, trial and error...until I catch the attention of the big dogs.
I think : Most of the magasine readers have followed the articles and updated their amp designs along the way.....

As i read your tread you're improving along reading the artikles, probably ending up with a design close to one of the articles series end design ?
-Maybee this wont catch the attention to The Dog until it is capable of grilling a hot dog?

Sinse i am only a smal cat and like to play with sertain things:
What is your ultimate design today ?
What would it bee tomorrow ?
Is the continus variable the way to go ?
-If so look at the BIG Dogs tail and improove it, if not make a BASTARD !

"The Bastard" has to bee better than the other dogs, as you make your BASTARD to bee the ultimate for the living room, for all the cats and dogs thats going too tuch it, smell it and having its drag race with it.
Now its gonna rain cats and dogs! It has to stay firm knowing this is easy handling.
A lot of ppl dont like Bastards, therfore your BASTARD has to give a **** abt what few ppl like or not.

Then your abt ready to pull out the GRILL, make a grill party! Ya know all the dogs has too bee grilled to bee hot dogs thats when the real taste com to life.



After all we are doing this for fun and audio mania
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Old 12th June 2018, 06:56 PM   #113
maxlorenz is offline maxlorenz  Chile
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Quote:
Originally Posted by R Dijk View Post
I think : Most of the magasine readers have followed the articles and updated their amp designs along the way.....

As i read your tread you're improving along reading the artikles, probably ending up with a design close to one of the articles series end design ?
-Maybee this wont catch the attention to The Dog until it is capable of grilling a hot dog?

Sinse i am only a smal cat and like to play with sertain things:
What is your ultimate design today ?
What would it bee tomorrow ?
Is the continus variable the way to go ?
-If so look at the BIG Dogs tail and improove it, if not make a BASTARD !

"The Bastard" has to bee better than the other dogs, as you make your BASTARD to bee the ultimate for the living room, for all the cats and dogs thats going too tuch it, smell it and having its drag race with it.
Now its gonna rain cats and dogs! It has to stay firm knowing this is easy handling.
A lot of ppl dont like Bastards, therfore your BASTARD has to give a **** abt what few ppl like or not.

Then your abt ready to pull out the GRILL, make a grill party! Ya know all the dogs has too bee grilled to bee hot dogs thats when the real taste com to life.



After all we are doing this for fun and audio mania
Ha, ha! I like your style man.

Yes a bastard it is but it is my bastard. And it will become even more bastardized as I gain experience and skill. For now, second day of listening test on a humble system, it is stable and stunning. Tested with chamber music, not girl and guitar music.

The ultimate design goal at present, as I said before, is to find the most transparent output section to exploit the LTMD benefits of input and VAS.

Speaking of which, I will have to test cascoded-cascoded-VAS, as Peufeu recommended.

Cheers,
M.
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Old 13th June 2018, 08:46 PM   #114
maxlorenz is offline maxlorenz  Chile
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In case you don't want to deal with potential oscillation problems, here a revisited version of my own splendid Low TMD amp with Tokin 2SK180 or THS51 VFET. This is the version with all-cascoded.

The VFET can be replaced by your prefered depletion Mosfet, but that would require adaptation of the Vbias, probably.

Even an enhancement Mosfet would do as cascode element, or a power BJT provided a change in biasing...trust me these Tokin amps are great.

This version is not tested yet, but will soon be, as I have the biggest heatsinks I could get... :-)
Attached Images
File Type: jpg diffamp CFP comp DOUBLE cascodo TOKIN SK180.jpg (118.7 KB, 115 views)

Last edited by maxlorenz; 13th June 2018 at 08:58 PM.
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Old 13th June 2018, 11:37 PM   #115
maxlorenz is offline maxlorenz  Chile
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This would be my Hagerman mod to the bias of the Blame PCB.

The extra compensation R* must be selected given the chosen BJT and its change in VBE from two selected points in the VBE v/s Ic chart, for example from 10mA to 100mA, as explained by the author.

I hope I got it well.
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File Type: jpg Dx Blame RED PCB HAGERMAN MOD.jpg (138.6 KB, 102 views)
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Old 19th June 2018, 11:42 AM   #116
maxlorenz is offline maxlorenz  Chile
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Mchambin wrote:

Quote:
I see this thread is mostly about input stage and VAS, I do not understand since those are class A stages known about no temperature effect from audio. May be at very low frequencies where junction temperature time constant could matter.
I think you may have nailed it.
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Old Yesterday, 01:09 AM   #117
maxlorenz is offline maxlorenz  Chile
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Amplifier runs stable for 10days now. Tested on two systems.
I will not sing the merits of the circuit. I've done that enough. Who wants to explore it, welcome.

I am revisiting the diffamp for my VFET single ended as this is a tricky balance act. I wil post the present circuit. It gives enough un-clipping gain since the VFET gives a gain of 10.
Attached Images
File Type: jpg diffamp CFP comp cascodo TOKIN SK180.jpg (97.9 KB, 45 views)
Attached Files
File Type: asc AMNESIS 44V LED Hagerman cascEF.asc (24.1 KB, 6 views)
File Type: asc DIFFAMP CFPcascoded TEST.asc (4.1 KB, 3 views)
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