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The Aleph Design Reloaded
The Aleph Design Reloaded
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Old 15th May 2018, 05:27 AM   #401
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The Aleph Design Reloaded
nothing is stopping you , when Revelations are in question



though , that's not Miller cap , more antioscillation thingie
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Old 15th May 2018, 06:12 AM   #402
sarathssca is offline sarathssca  India
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Quote:
Originally Posted by Zen Mod View Post
nothing is stopping you , when Revelations are in question



though , that's not Miller cap , more antioscillation thingie
Could you please clarify , I didn't understood ..
I have seen many amps /preamps where input LTP stage is connected to VAS transistor's base/gate and there is a capacitor connected to base and collector of VAS transistor .. in explaination it was given to be for handling Miller effect at high frequencies ..
But in any of the aleph circuits or in ba-1 or ba-2 circuits, I haven't seen any such capacitor on the VAS MOSFET ..
Could you please give some inputs regarding this ..

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Old 15th May 2018, 06:49 AM   #403
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well , being aware that I'm not even a deck-boy on this ship , I'll try .........

it is more matter of looking at Goat - is it better from front , or from back side ?

some amp designers/tweakers are using Miller capacitance term speaking of sort of problems , while other designers/tweakers are using "oscillation" term , addressing their concerns/intentions ...... while ,evidently, family of exact same cures is used in practice

however , Miller capacitance , at least to my understanding, is brought when frequency linearity is objected , while oscillations is used when "amplification phase" is of primary concern thus overall gain stability

stability per se , when circuit is translated from paper to physical world , is complemented with actual physical layout (pcb , wires etc.) so , in s some cases , Papa was able to squeeze through without compensations , with amp having more than enough clean phase behavior , while - in some other cases - phase compensation was/is necessary

explanation can be , probably , found in overall simplicity of his amps (read - minimal number of stages), and in fact that he's either talented , or versed , or both - in solving PCB puzzles
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Old 15th May 2018, 09:53 AM   #404
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to play with the stock aleph 3 bias is it R113 to replace with a variable resistor ? what value ?
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Old 15th May 2018, 10:27 AM   #405
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The Aleph Design Reloaded
here is all info you need
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Old 15th May 2018, 02:12 PM   #406
juanitox is offline juanitox  France
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thank you Zen , if it"s the Pimp my aleph thread is it better to use a special fast/soft recovery bridge with simple C filter or leave the stock one ?
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Old 15th May 2018, 04:30 PM   #407
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R105...is the change to 3.3K applicable to 2SJ313 inputs only, or can you use it with IRF9610 as well? Does the change to 3.3K from the usual 10K in Aleph schematics a function of the rails, or can you apply it to all Alephs? I've simulated various R105 (3.3K, 10K, 2K, 1K), and found there isn't much of a change in mA of the current source. Just trying to understand this partiular change.

Thanks
John
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Old 15th May 2018, 04:40 PM   #408
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The Aleph Design Reloaded
Papa explained that - in some specimens there was too much zener noise with original value
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Old 15th May 2018, 04:49 PM   #409
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Doesn't adding a cap across the zener solve the issue?
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Old 15th May 2018, 06:32 PM   #410
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The Aleph Design Reloaded
you can do both

however ...... combined with whoknowswhich RC constant in PSU , up from some value of C , it can slow ramp up of CCS and induce plop! in speaker during powering on

so , try and tweak , if needed
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