MDA-400 (Some hidden features)

[AP2]

Originally Posted by Workhorse

See the difference , your own simulations speaks in favour of my results.

Obvius that know, see, but in this case not need a precise sensing, is sufficient 2uS to low for break,maybe not read my post?
well, when i need complex solution, then call you.

[Workhorse]

Originally Posted by AP2

Obvius that know see, but in this case not need a precise sensing, is sufficient 2uS to low for break,maybe not read my post?

I already said, it can sense short circuit in my above posts, because of its brute nature and in event of short circuit the current flow is quite large enough to trigger the optocoupler. But not to forget the asymmetric trigger threshold in your case will allow more negative current to flow in order to sense the short circuit which will cause more delay than a positive threshold.


Precision is needed when someone wants an overcurrent protection also along with short circuit, which necessitates the sensing must be symmetric for both polarities. The way i have modded the circuit clearly sets the goal .

[AP2]

Originally Posted by Workhorse

I already said, it can sense short circuit in my above posts, because of its brute nature and in event of short circuit the current flow is quite large enough to trigger the optocoupler. But not to forget the asymmetric trigger threshold in your case will allow more negative current to flow in order to sense the short circuit which will cause more delay than a positive threshold.


Precision is needed when someone wants an overcurrent protection also along with short circuit, which necessitates the sensing must be symmetric for both polarities. The way i have modded the circuit clearly sets the goal .

A truly effective protection can not be based only on the sensing symmetrical (certainly important). the repetition of the maximum current, will still result in the destruction of the amplifier. therefore need more support mechanisms (that 'MDA, has on board).
My last amp, as well as a sensing differential (as instrument's), is based on the difference between the input signal and the output, "to see if it has restart).then remaining as limbo up to schortcut is permanent.
Then this discussion does not make sense, I do not think I can learn from you (sorry for this).

This is balanced, but without adding parts as you did.
Note that at 10Kz, the pulse lasts 5 times more than enough to stop the amp.

[tinitus]

gentlemen, please stop all 'personal affairs' now

posts deleted


moderation

[AP2]

I do not feel like to push this amp. maybe it sounds really like the class AB, with real definition of the high range. but who cares about that? certain to me very little. People who have this amp have already tried everything. this is my satisfaction.
At this point, my thread can also remain desert for me.

[AP2]

Hi,
I reflected on the circuit "current output protection" of the MDA-400. haha! sorry.. I have one broken wire connection when re-write it and translate as pic.
in fact, as I have described, is ingenious that the threshold value is zero if there is no current from ddp.
When mature the ddp, the threshold is unbalanced and creates a sum or subtraction.
As you can see, there are no additional parts or value changed, the result is perfectly balanced.