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-   -   quick question ... really (http://www.diyaudio.com/forums/solid-state/63885-quick-question-really.html)

m0nty 7th September 2005 04:11 PM

quick question ... really
 
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 7th September 2005 04:18 PM

2 Attachment(s)
schematic

Jan Dupont 7th September 2005 08:38 PM

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 8th September 2005 08:17 AM

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 8th September 2005 04:01 PM

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

m0nty 8th September 2005 07:04 PM

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 8th September 2005 09:29 PM

You're welcome ;)

destroyer X 9th September 2005 03:43 PM

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


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