I made a simple voltage regulator with lm317. It consists of 12V 1A transformer, bridge, filter cap, and two lm317's in parallel, one for 5V/3.3V, the other for 1.25-13.75V.
It worked fine for a bit, and then suddenly the max output voltage of the second one was not 13.75 anymore, but 11.5V. Also, on transformer output the voltage was not 13V without load anymore, but about 10.5V.
Where should I search for the problem?
It worked fine for a bit, and then suddenly the max output voltage of the second one was not 13.75 anymore, but 11.5V. Also, on transformer output the voltage was not 13V without load anymore, but about 10.5V.
Where should I search for the problem?