ATX brown wire sense range

[harp]

I thinking to modify some ATX ver 1 supply, and wonder what if I connect 10k pot on 12v and center tap on brown wire? What range of 3.3v correction can to expect, or something will blow up if I close to rails, leave narrow 3.3v range?

It is KA7500B ic, but 3v3 sense is connected to TL431, I am not sure there is any connection between.

[CapLeaker]

How did you get this idea and for what reason? I am just curious as I am drawing a total blank. Lol

[stj]

some psu's have an extra wire to the connector for voltdrop sensing.
i doubt it will tollerate more than a volt before just shutting down.

[CapLeaker]

I do understand what that wire does. But why fiddling with it?

[harp]

Yes, sorry I not mentioned...
Idea came from me myself, and with reason to can adjust low voltage for testing purpose (not computer). So you go for 2.5v - 4.0v range?

Supply have also -5v (white) and come to me without case and wires. It almost begging me to be incorporated somewere

[temyth]

Yes, sorry I not mentioned...
Idea came from me myself, and with reason to can adjust low voltage for testing purpose (not computer). So you go for 2.5v - 4.0v range?

Supply have also -5v (white) and come to me without case and wires. It almost begging me to be incorporated somewere

why dont you place the 10k pot between the feedback rail and the optocoupler that feeds back the primary that way you can fully "simulate" the feedback.

[harp]

why dont you place the 10k pot between the feedback rail and the optocoupler that feeds back the primary that way you can fully "simulate" the feedback.

I am not sure what you mean, can you sketch some circuit with pot placement?