how to protect it?

[watzmann]

Hi All,

how to protect 78L05 from being short circuit ?

should i use diode between output and input terminals ?.....what is the value of the diode


Thank you

 

[ericgibbs]

Hi All,

how to protect 78L05 from being short circuit ?

should i use diode between output and input terminals ?.....what is the value of the diode


Thank you

hi,
The 78L05 has inbuilt short circuit protection, see jpg

The diode across the 78L05 is to protect it from a reverse voltage.
Usually a 1N4001 diode would do the job.

EDIT: this 2nd jpg shows more detail, I realise its a LM317, but it shows the purpose of the diodes.