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DC power supply goes wonky DS 08-08-2005
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Posted by DS on August 8, 2005, 8:45 am


I have a 12 volt power supply that converts 110AC to 12V DC (actually 13.5.)
I haven't used it for some time.
I was using it to check some wiring and find it is now putting out 21 VDC.
???
ds


--
THE WORLD WILL END TONIGHT AT 9 O'CLOCK!
(9:30 in Newfoundland.)




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Posted by Pop on August 8, 2005, 9:54 am



>I have a 12 volt power supply that converts 110AC to
>12V DC (actually 13.5.)
> I haven't used it for some time.
> I was using it to check some wiring and find it is
> now putting out 21 VDC.
> ???
> ds
>

Is there a question there? Sounds like a rectifier
blew.

>
> --
> THE WORLD WILL ENDed Last NIGHT AT 9 O'CLOCK!
> (9:30 in Newfoundland.)
>




Posted by Matt on August 8, 2005, 10:57 am


Whatever you are using to check it's output voltage is upside down.
Flip it over and it will read 12 instead of 21.



Posted by on August 8, 2005, 2:36 pm



>I have a 12 volt power supply that converts 110AC to 12V DC (actually 13.5.)
>I haven't used it for some time.
>I was using it to check some wiring and find it is now putting out 21 VDC.
>???
>ds

It may be intended to have a load on it. Some cheap supplies will have
a big number when unloaded.


Posted by Rich256 on August 8, 2005, 5:50 pm



> I have a 12 volt power supply that converts 110AC to 12V DC (actually
13.5.)
> I haven't used it for some time.
> I was using it to check some wiring and find it is now putting out 21
VDC.
> ???
> ds
>
>
Really need more information. What kind of power supply and what is it
supposed to be used for. If has a regulator it appears it may be bad. To
find the problem you have to go inside and measure the voltage before the
regulator if there is one.





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