quick question ... really

m0nty · 7th September 2005, 03:11 PM

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, 03:18 PM

schematic

Jan Dupont · 7th September 2005, 07:38 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, 07:17 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, 03:01 PM

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

m0nty · 8th September 2005, 06:04 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, 08:29 PM

You're welcome

destroyer X · 9th September 2005, 02:43 PM

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

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

arrivederci

ciao

Carlo

7th September 2005, 03:11 PM	#1
m0nty diyAudio Member Join Date: Feb 2005 Location: near Venice	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

7th September 2005, 07:38 PM	#3
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	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.... __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

8th September 2005, 03:01 PM	#5
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	Do you use a single prim/single second. trafo as shown in the schematic ???? __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

8th September 2005, 08:29 PM	#7
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	You're welcome __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

9th September 2005, 02:43 PM	#8
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	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 __________________ Audiophoolery; http://www.youtube.com/watch?v=m7ERMu825m4; Dx Super Etching; http://www.youtube.com/watch?v=WED3Bvmxepk


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8th September 2005, 07:17 AM	#4
m0nty diyAudio Member Join Date: Feb 2005 Location: near Venice	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

8th September 2005, 06:04 PM	#6
m0nty diyAudio Member Join Date: Feb 2005 Location: near Venice	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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