This is crazy to me. I have built a dc power supply with a total 25.2 V transformer and the typical lm317, 220ohm, two caps, and a 5000k Pot. The problem is when i turn the pot down around 13V or less, the pot starts sparking and i actually burned up a lm317 at one point.
Now what is crazy to me is that it is wired correctly. The lm317 is not grounded other than tied to the pot like it should be. The 220ohms goes from one leg of the lm317 to the tie on tab and goes to the last Cap from there.
Im probably rambling so i'll stop at that , but does ANYONE have a clue as to what could cause this.
Any info. would be greatly appreciated,
Stan
Now what is crazy to me is that it is wired correctly. The lm317 is not grounded other than tied to the pot like it should be. The 220ohms goes from one leg of the lm317 to the tie on tab and goes to the last Cap from there.
Im probably rambling so i'll stop at that , but does ANYONE have a clue as to what could cause this.
Any info. would be greatly appreciated,
Stan