what element in this circuit is important for output current?

Hi Navidrct,

Thank you for your inquiry. I don't have viewer of that type of file. Can you send me a PDF file of your circuit? Also, please send me the PIEXpert or PIXls that you may have used to generate the circuit and calculated the transformer design.

Regards,
PI-Picard

this is pi expert soulotion

https://ac-dc.power.com/sites/default/files/forum/files/1.png

i cahnge all component to whatever pi expert says but still low current (250mA)

what should i do 

i need atleast 500 mA

Hi,

I made a PIExpert design but it is giving a different schematic. See the attached schematic. Can you give me your design requirements and send me the PIExpert file please?

Do the following:
1) As a quick check, at 265Vac power-up at no load, if it powers up at 0A load and the output is a regulated 5V, then load 1A.
2) Increase the input cap to 2x the current value say 2x 2.2uF. Do item (1) but power up at 195vac.

Depending on the above results, either increasing the input capacitance or keeping it, what you can do next is to trim R5 until the output can load 1A full load.

Regards,
Alvin

Regards,
PI-Picard