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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
unsymmetrical voltages on PSU
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dnny



Joined: Mar 12, 2005
Posts: 519
Location: Helsinki, Finland
Audio files: 8
PostPosted: Fri Jul 29, 2005 3:06 am    Post subject: unsymmetrical voltages on PSU Reply with quote  Mark this post and the followings unread
hi all
im wondering if i could use an old PC power supply for my SL

the label says +-5V and +-12V
,but my multimeter says its +10.9V and -8.8V
so there is 2.1V difference - is it normal ? Smile
okay not normal but is it bad if i use it ?


dnny
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dnny



Joined: Mar 12, 2005
Posts: 519
Location: Helsinki, Finland
Audio files: 8
PostPosted: Fri Jul 29, 2005 10:37 pm    Post subject: Reply with quote  Mark this post and the followings unread
new day new power supply...
so the one i have now gives
+11.67V and -11.93V

the difference is now smaller - but should i limit the voltage to get both ends in symmetry?

do you have your voltages symmetrical? and is this even an issue ?

daniel
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etaoin



Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
PostPosted: Fri Jul 29, 2005 11:40 pm    Post subject: Reply with quote  Mark this post and the followings unread
I shouldn't worry too much about small differences. Even if you were to run it from batteries they would always differ slightly.
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3phase



Joined: Jul 27, 2004
Posts: 1183
Location: Berlin
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PostPosted: Sat Jul 30, 2005 5:15 am    Post subject: Reply with quote  Mark this post and the followings unread
Etaoin wrote:
I shouldn't worry too much about small differences. Even if you were to run it from batteries they would always differ slightly.


It will work but it slightly changes the sound (more distortion) when the
Voltage is not symetrical. In your case its probably not easy to hear a difference.
It´s not optimal to use switched powersupplys with analog equipment...
Even when its regulary done this way to day you have HF problems and current leakage problems, that are maybe solved in a yamaha digital desk but sometimes make DIY projekts a real hazzle.
depends on the quality of tthe powersupply..
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