quick question ... really

[m0nty]

i have just finished building a psu for my headphone amp
it's transformer + rectifier bridge + regulator + caps
now, the - (minus) from the rectifier bridge is ground.
my question is: should I connect it to the mains earth or not? i'm asking this because i see most wall wart have only 2 pins ...
thanks

 

[m0nty]

schematic

 

[Jan Dupont]

First: Why do you want to connect it to mains earth ?
Next: If you do, put in a resistor (10R or so) in series to earth.... 😉

 

[m0nty]

that means I shouldn't do it, right?

i tried to power up the psu, but the fuse (2A fast) blows...
i have no idea what could it be, i'll try "debugging" each stage
shouldn't be errors in the schematic, i just copied from lm317 datasheet

 

[Jan Dupont]

Do you use a single prim/single second. trafo as shown in the schematic ????

 

[m0nty]

thanks i found the problem
the transformer is a 0-115 115-0 -> 0-9 9-0
wired as 230 -> 18
everything works now, and it works great btw
thanks for the replies
Nicola

 

[Jan Dupont]

You're welcome 😉

 

[destroyer X]

Va molto benne signore, il filo de colegamento inverso

Had mistakes in wiring...now the invertions were correct.

So, no more problem related ground....Va benne.

arrivederci

ciao

Carlo