Sorry
Can not explain, it was a lot of research at the time ... but the basis was the mentioned post #3 circuit, not even sure i can find my schematics, my psu is a mix of a few separated circuits put together
The biggest drawback, is not having a multitapped secondarie(s) transformer, when you short it to the max even with a foldback circuit, it will heat ... kinda a lot loll
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Here's a beautiful circuit tested an proven working, a dual 723 circuit, explanations and schematics included, i know there is pcb gerbers available ...
https://www.velleman.eu/products/view/?id=9375https://www.velleman.eu/downloads/0/manual_k7200.pdf-------------------------------------------------------------------------------
I dont know your electronic knowledge, sometimes it can be difficult to explain how some circuit can work, the datasheet helps a lot, lots of researchs ... explanations of knowledgable people(s) can help
I am a self taught technician in computers, electronics industrial stuff, broadcast equipements, tv, vcr's, audio sound systems, car mecanics, truck driver ... i did had specialization at school, but i was too advanced for my classroom etc ...
I'm in this stuff since im 14 years old now i'm 51 years old loll Senior tech at an international company in Canada.