diyAudio (
-   Solid State (
-   -   quick question ... really (

m0nty 7th September 2005 03:11 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 ...

m0nty 7th September 2005 03:18 PM

2 Attachment(s)

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

Jan Dupont 8th September 2005 08:29 PM

You're welcome ;)

destroyer X 9th September 2005 02:43 PM

Va molto benne signore, il filo de colegamento inverso
Had mistakes in the invertions were correct.

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




All times are GMT. The time now is 01:22 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2