LM317 protection

[ataul]

Hi ataul,
Yes, that is what I meant. I have also just noticed that you do not have a capacitor from the output of the LM317 to ground as shown in the data sheet. I think building a supply designed for the voltage you require as suggested by Tony would be a better solution than connecting supplies in series.

Les.

its works fine!!!now my LM317 has been protected. I don't use fuse .thanks Les Jones.

 

[Tony Stewart]

The shunt diode should be rated for 10A to protect the LM317 and shunt the short circuit current of the 2.5A supply capacitors and you can use a Polyfuse instead to protect both.