I was doing a DIY bench top psu, i know that thousands of tutorials are out there just I have an issue here..
I have already worked on out body of it drilled painted etc, its a dell psu (no model number as the label is gone) , it was working by shorting green with black , and even before that by holding its power test button.
now there is the problem , in addition to fixed voltages, I wanna add a variable terminal using the commonly sold chines 12v to 12-34v dc and I will extend the pots to the body to varry voltage.
now the issue is when i feed it 12v in ftom the power supply either yellow 12v or white 12v it works for 2 seconds then auto trips, tried feeding 5v instead it doesn't trip, however i wanna feed 12v in..
is it a faulty psu ? the 12v to 34v pcb is working i tried it even with another 12v source working not shorted..
any clues please?