One of the components that I had replaced that I am now in doubt as to whether I put the right or the wrong one would be the TL431 smd position Q8. What was before was a smd equal to the figure (download).

What I put now has a code 43A smd. My doubt would be if the 43A I put is a TL431 or not. If the 43A is not a TL431, how do I connect a TO92 TL431?

Smd component 43A is KA431SMF.

СКАЧАТЬ KA431SMF : KA431SMF.pdf

I put the regulator Q8 (TL431 TO-92) in place of the smd and another thing I noticed is that the diode connected in series with a resistance of 10R was diode 1N5399 in pin 7 do SG6841 , I found it strange because it is not a fast diode, so I changed and put a fast diode in place. Turning on the power supply provided the correct and stable voltages. At the source output, there would have to be a voltage of around 14v to charge the battery. This tension arose normally. Only to see if the voltage above the B + capacitor connected to the rectifier bridge is correct, it is showing around 190v (I am connecting the source to a 110VAC network).

I tested the power supply on 110V and it worked fine. If it is connected to 220v, what voltages will I get on the SG6841 circuit?
Which components or part of the circuit stabilizes the voltages allowing it to work in both 110 and 220v?

Turning on 220v will not have a waveform 2x bigger in the drain of the mosfet than if it was turned on 110v consequently a higher voltage at the output?

over the DC.out output capacitor of fig. OB2268OB2269.jpg I get a voltage of 14v with the source connected to 110v.

Voltage range: 110-240V AC 50/60Hz

See the input circuit of your power source (the voltage across the capacitor B + should be 300V).

This power supply does not use a voltage selector switch, nor does it use two capacitors C1 and C2 connected in series at the output of the rectifier bridge like the one shown in the photos. Uses only a 100uF / 400v electrolytic capacitor at the output of the rectifier bridge. When I connect the source to the 110V mains, I get a voltage of around 175v over the 100uF / 400v electrolytic capacitor.


I would have to analyze the attached photo

The voltage on the capacitor C8 is 14v when the source is connected to 110v and at this moment the source is working normally. Will it be normal when connected to 220v also work?