What voltage and current do you normally use when doing electrolysis?

 

It will never come close to delivering 5A when the output is adjusted down to 1.25V.

That's why I told him to switch off half the transformer in post #23, drawing 1
That will get the power down to 60 watts and the thermal resistance budget is about 0.26 C/W case to ambient or 3.79 W/C
That's a finned heat sink about 8 inches by 12 inches and an inch thick without a fan.
I guess this one is going to need a fan or forget about dialing the voltage to 1.25 volts and trying to get 5 amps out of it.

I don't really need 5 amps neither going down to 1.25v. So what's my best option with what I have?

Your best option is to tell us that about 39 posts ago. How many people do you think are going to start over now that you changed the design to an electrolyser instead of a power supply?

 

What voltage and current do you normally use when doing electrolysis?

That's why I want a power supply to find that!
I don't know actually so I need to regulate voltage and/or current

 

I would start by looking on google for the electrolysis material, such as what metals like probes, what chemicals in use, and see what comes up with voltage ranges.

 

That's why I told him to switch off half the transformer in post #23, drawing 1
That will get the power down to 60 watts and the thermal resistance budget is about 0.26 C/W case to ambient or 3.79 W/C
That's a finned heat sink about 8 inches by 12 inches and an inch thick without a fan.
I guess this one is going to need a fan or forget about dialing the voltage to 1.25 volts and trying to get 5 amps out of it.

Your best option is to tell us that about 39 posts ago. How many people do you think are going to start over now that you changed the design to an electrolyser instead of a power supply?

Well I need a power supply, thats why I'Ve posted this... I've bought the new transformer like you've told me...
By the way I did explain in post 31 that my friends need this for electrolysis.. So sorry if you didn't get that. I am new in all of this and don't understand it quite well. I'm trying to find the best way to fit his needs for a power supply.

 

In the tutorials my friend see, they use 2 car batteries to make electrolysis. But my friend need a power supply with variable voltage that can be plugged in the wall. So that's why I am making him a power supply. I just want to find the best way to do it.

 

Then you may need more current, what are they metal plating, or just separating oxygen and hydrogen from water?

 

Then you may need more current, what are they metal plating, or just separating oxygen and hydrogen from water?

Exaclty he wants to separate the oxygen and hydrogen from water!

 

Now, you got the hard time, because you meet the hard power -- the real constant current source, the output current should be constant won't follow the resistance of the electrolysis liquid changing, I'm not sure you can do it, it is an expensive power device.

 

Exaclty he wants to separate the oxygen and hydrogen from water!

Is he trying to blow himself up, or get better gas mileage???

 

Well having searched Google, looks like electrolysis voltage is from 1.2V to 12V, between 3 to 10amps, depending on the solution mix.