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Old 7th September 2005, 03:11 PM   #1
m0nty is offline m0nty  Italy
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Default 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
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Old 7th September 2005, 03:18 PM   #2
m0nty is offline m0nty  Italy
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schematic
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Old 7th September 2005, 07:38 PM   #3
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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....
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Old 8th September 2005, 07:17 AM   #4
m0nty is offline m0nty  Italy
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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
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Old 8th September 2005, 03:01 PM   #5
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Do you use a single prim/single second. trafo as shown in the schematic ????
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Old 8th September 2005, 06:04 PM   #6
m0nty is offline m0nty  Italy
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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
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Old 8th September 2005, 08:29 PM   #7
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You're welcome
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Old 9th September 2005, 02:43 PM   #8
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Default 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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