You may buy a linear power supply or build one as Regulator 0-30V 5A by IC 723 & 2N3055, I bought a kit similar as that long time ago and it still working.

Isn't 5A a little much? That would give you a good shock

 

Isn't 5A a little much? That would give you a good shock

It won't hurt you.
You can only using one power bjt 2N3055 and reducing the current of transformer, then the current will be down.

 

yes if you draw a high current, what do you have in mind , modifying an Atx, or making a linear one?

I was thinking 1.5A max or min. I don't really know what would be safe for circuitry. I might possibly use it to prank my friends, since 2-3 amps is a wonderful feeling