because i am a beginner i need a little bit of help from you guys. I have fixed power supply model PS1303 it was fixed to 13.8V and i have added to it ammeter and in inside was small pottentiometer 470k for adjusting voltage from 12 to 16V. I replaced that with B500K and now i can adjust my voltage from 6.8 to 25V.I also for good measure replaced caps that were 100uF 25V to 100uF 35V.The question is can i somehow make it adjustable from 0-25V and what would be next step to do. Power supply uses transformer and a small board that converts AC to DC, also one 2N3055 transistor.
Thank you wery much for your help and opinions.