7v from a computer power sorce question

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Discussion in 'General Electronics Chat' started by thetank, Feb 14, 2007.

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Feb 14, 2007 #1

thetank Thread Starter Member

Feb 13, 2007

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0

can some one tell me how you can get 7v from a computer power supply by connecting the 12v+ and 5v+ together and not hurt anything?

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Feb 14, 2007 #2

beenthere Retired Moderator

Apr 20, 2004

15,815

293

If they do, it won't be true. You might feed an LM317 with the =12 output and use it to supply the +7.

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Feb 14, 2007 #3

n9352527 AAC Fanatic!

Oct 14, 2005

1,198

5

Some say that connecting the load between 12V and 5V terminals gives 7V supply (12-5=7). I wouldn't want to bet on how safe this is, probably will work with small load harmlessly as their grounds are shared. Large load would probably not be safe.

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Feb 14, 2007 #4

Porkchop Member

Feb 5, 2007

17

0

It does work the 7V measured it the potential difference.

Regarding safety i'm not sure. People only use this for running there 12V fans at a lower rpm.

Id say its bad practice and not a good permant solution but i have never heard and horror story's on the net because of this ?

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