Power supply circuit

[logeshbe6]

 

[shokjok]

The resistor feeding the LED at the 5-volt output should be 470 or 560 ohms.
I'll try my PC817 optos to see if 0.8 volts turns it on.

 

[fourtytwo]

Woww no primary snubber BUT what is the OP's question ??????????

Ohh I see, it's in the form of a vote.....

Let's start with where on earth did you get the circuit ?

 

[gophert]

What material, diameter and length of the core?
and the Asterisk(*) in the image says there is a video, where is it? And how clueless was the anyone to mistake a 260k ohm for 2.6 ohm