Power Supply with 12V and 10A or 5A

[Twodio]

Hi guys.
I'm trying to build a power supply to use like station of galvanisation at home.

But i never built one power supply, because i haven't the great part of required components. But now i want to try.

Maybe will be a good progress to me and will be usefull.

A complete rectified power supply if can i call it.
I already know that i will need:

Transformers ( i have one with 230 to 12.5 1200mA and another with 230 to 18 220mA).
Rectify diodes 1N4001.
LM358.
Capacitors.

I don't know how to get 12V with 5A or 10A if possible because the transformers have less than 5A.
Somebody know how?

 

[duke37]

You cannot get out more than what the components are rated at, at least, not for long.

Can you borrow a simple battery charger of 5A, this will give the rectified output required.
A car headlight bulb in series with the output will limit the current to a safe value and give an indication of current drawn.

You may not need any capacitors if the deposit will work with pulsed DC.

What is the LM358 for?

 

[Twodio]

Battery charger with 5A ? I never saw, i just found out with 500mA.
The LM358 i saw in one schematic of power supply.
Another idea?

 

[duke37]

Battery chargers for charging car batteries are normally capable of several amps.

They do not plug into the wall but are made in a separate box, usually with an ammeter. I have a 10A one.

Modern complex chargers often will not turn on unless correctly connected to a battery. You do not want one of these.

 

[Twodio]

Alright, now i understand but for it i'll need to buy one.
I want to know how build a power supply with voltage of my preference.
That way i'll learn and get something.