Thanks alot for the replies. I already thought of reverse engineering, but i rather don't if i don't have to (since it is alot of work) . Also thanks for the schematics and the link to that book. But it's not even one year since i began electronics so some things are difficult to grasp. Maybe i just leave this project until my understanding of electronics is a bit better. But first i will try to solve the problem with your advice. I'm a newbie but the first thing i did was keeping everything safe so i have a variac, isolation transformer and a current limiting light bulb. Thanks again i will make an update on this project so you know how it went.
With the schematic, should i follow the wires of the voltage adjustments to the pots to figure what's their function? So if i follow the 1.5 v wire of the adjustement, will it lead me to the pot for adjusting the 1.5V or am i wrong to think like that?
Thanks again!