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+- power supplies

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 Author Topic: +- power supplies  (Read 1131 times)
Ritmo2k
Newbie

Posts: 1

 « on: January 19, 2006, 10:16:41 PM »

I have been out of electronics for too long. Can someone point me to a definition to understand what a +/- powersupply is, and how you attain it? Specifically like a computer type switch mode ps, what does a +5 and -5 volt mean?

And I dont mean the generic polarity of a trivial ps either;->

Thanks
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indulis
Electronics God

Posts: 651

 « Reply #1 on: January 20, 2006, 08:02:24 AM »

A power supplies output is only the voltage potential between the terminals. It's polarity is determined by which terminal is used as the reference.
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prateeksikka
Electronics God

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Posts: 690

KNOWLEDGE-AN OCEAN WHERE WE SIP TOGETHER

 « Reply #2 on: January 20, 2006, 01:29:00 PM »

just for  a beginner :

for any circui to function with reliablity except for special autotransformers,
+/-5V is equivalent to 0 and 10V supply.

potential difference requires no reference but a potential does.
thats it.

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prateek

EdwardM
Full Member

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Posts: 243

Trust me, I'm not a Doctor

 « Reply #3 on: January 20, 2006, 03:46:39 PM »

Hi Ritmo2k

I've tried to answer what I think is your question with a diagram...

+5v means a positive supply relative to some common terminal and likewise -5v means a negative supply relative to some common terminal.

Hope that helps

Ed

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Be nice to newbies, he or she might be your boss one day

prateeksikka
Electronics God

Gender:
Posts: 690

KNOWLEDGE-AN OCEAN WHERE WE SIP TOGETHER

 « Reply #4 on: January 23, 2006, 04:52:42 AM »

i always compare voltage with water levels.believe me there is perfect analogy.
ive seen people
converting electrical problems to hyraulic problems and solve them.!!!!!!
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prateek

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