13.8V 20A power supply by Santa

[Nadi1]

Hi guys!!!
i cam across the 13.8V 20A power supply project by  Santa Cruz http://www.electronics-lab.com/projects/power/002/index.html

Fisrt, thank you very much for this informative project!

second, i have some question,
i have a  transformer who get 220v as input and on the output it give 17~18v 400VA

my question is are this  transformer can handle 30A right? 33.3A (400/12)
so if i am did not wrong, how can i use this transformer in this circuit? i mean to get 30A output?
what should i change?

Thank you very much,
and sorry for my poor English.

 

[audioguru2]

I came across the 13.8V 20A power supply project by Santa Cruz.

I have a  transformer which has 220v as input and on the output it gives 17~18v at 400VA.

Can transformer handle 30A? 33.3A (400/12)

No.
Your transformer has a max output of 17V to 18V at 400VA. Then its max output current is 400/17V= 23.5A.

 

[Nadi1]

HO, you right thank you, 12 is only after the bridge and DC...
but i still need to change some materials here.... am i right?

 

[Hero999]

Yes,you need a larger transformer amongst other things. Read the text associated with the project: it gives a clear explanation of how it works and how to alter the current limit.

 

[Nadi1]

yes i have a larger transformer and i read the text but i dont know witch part in need to put...

 

[Artk]

Hi there, I also reproduced http://www.electronics-lab.com/projects/power/002/index.html but I need your help to regulate tension from 1.5 to 14V, so I'll appreciate your suggested wiring and component values if I'm considering connect 7812 IC1 in ground terminal to a P2. Thanks and regards.