Krill - The Next Generation

[GK]

Originally Posted by stinius

andy
That is not fair.
You can like or dislike the design, but saying that steve has been lying is not right.
He has even tried to learn LTspice to do the same simulations as you and a lot of other do.
He made some mistakes, and admitted that, but if you are saying that he has been lying about his results you must really be some kind of a guy.

Excuse me?

Compare the (contrary to reality) claim made in post 208:

Krill - The Next Generation


With the facts of the matter provided by someone who actually posted evidence of having run a simulation with the driver biasing resistor, instead of just saying that they did:


Krill - The Next Generation


This thread has once again moved on to feigned moral outrage by one wishing to evade the basic technical facts of the matter – that is what is “despicable” in the whole charade.

[scott wurcer]

Originally Posted by AKSA

If you would like to 'correct' my explanation of Steve's circuit, perhaps you could send it to me in a PM. I will certainly give it my time.

Hugh there is no need for this acrimony, just step back for a moment and think about it. An output stage is sitting at say an amp into 4 Ohms. It matters weather it was at 4 amps 10 usec before or not. Past history is important. Any description that walks through a circuit in a DC matter does not describe the behavior in a dynamic sense. I'm trying to make you think about the misunderstanding without being confrontational.

[GK]

Originally Posted by GK

Anyway, getting back to the attaced simulation; in the first attached picture the green trace shows the ballast resistor current for the complete Krill output stage which has been modified with a 20 ohm bias resistor for driver transistors.
The red trace, for comparison, shows the ballast resistor current of the non-krill output stage with ideal voltage source bias and no bias resistor for the drivers.

Oh, an just for good measure here is the operation of the 4-transistor pair output stage with a 220 ohm biasing resistor. The switching is much less abrupt, but it is still well and truely enough to make the krill circuit switch.

[jkeny]

Originally Posted by stinius

Mr AKSA (Hugh)

I don’t think Steve needs your”help” here. He is a respected member.
You actually remind me of another “helping hand” in another thread.
BTW the circuit and explanation you have on Steve’s web page is not right.

If you like to discuss, you have your own forum, bring it up there instead of hijacking here.

Cheers

I believe you are referring to me, stinius, so who appointed you as the moderator of this thread - what gave you the notion that you can tell Hugh to post on his own forum or otherwise police this thread? Why not refer to the "helping hands" that I see posting in "group" mode again here as in the other thread. I see the venom has started again - I'm backing out of the snake pit now!

[syn08]

Originally Posted by AKSA

Hey Syn08,

Could you please commit, and answer the question?

I usually respond pretty bad when summoned, but I'll make an exception, here's my answer (and I really mean it):

Maybe, I don't know.

[lumanauw]

Hi, AKSA,

I appreciate that, you refer to, amongst other things, 'memory' effect, described by Lavardin.

Could it be something similiar, the "trapped base charge effect" that causes this soft switching? Without the driver's emitor resistor (bleeder for this base charge), the remaining trapped base charge will continue opening the output transistors, making somekind of shoot through between upper and lower output transistors. If this is true, then this effect should be more obvious at higher frequencies than lower frequencies and should vary with different type output transistor (different hfe and different base capacitance), for the same frequency.
If this effect caused by the bias chain, then it shouldn't vary much with different output transistors.

[wahab]

Originally Posted by GK

Alternatively, you could just remove the driver bias resistor from the plain double EF (with standard Vbe multiplier bias) for the same behaviour.

true, simulations clearly show it...
and i use another simultor than LTsp.

[Salas]

AKSA post removed on language grounds. Please watch your arguments tone in general in this thread gentlemen.

[wahab]

here the simulations i made, measuring the power pnp
output device collector current across a 0.001R resistor,
comparison between krill and a classic EF....
the graph show that the effect is intrinsical of the absence
of driver bias..1K resistors where used for bias...

regards,

wahab

[tinitus]

So, please allow me a simple question

I suppose none of you will never build it, but others may

What would you want to happen here, further on, about the Krill ?