+12V (10A) and -12V (0.3A) rating supply question
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 4th January 2013, 02:22 AM #1 iinself diyAudio Member   Join Date: Dec 2012 +12V (10A) and -12V (0.3A) rating supply question Hi, a beginner question - can somebody please explain what would be the max current I can draw from a PSU that has one line with 12V (10A) and another line with -12V (0.3A) if I connect these 2 lines to a load? Would I be able to get 10A or will I get only 0.3A ? Thank you Arvind
 4th January 2013, 04:10 AM #2 DUG   diyAudio Member   Join Date: Jan 2003 Location: mississauga ontario canada Do you mean like 24V ct @ 0.3A ? __________________ Doug We are all learning...we can all help "You can't stop the signal, Mal. Everything goes somewhere..."
wahab
diyAudio Member

Join Date: Nov 2009
Location: algeria/france
Quote:
 Originally Posted by iinself Hi, a beginner question - can somebody please explain what would be the max current I can draw from a PSU that has one line with 12V (10A) and another line with -12V (0.3A) if I connect these 2 lines to a load? Would I be able to get 10A or will I get only 0.3A ? Thank you Arvind
0.3A

 4th January 2013, 02:48 PM #4 iinself diyAudio Member   Join Date: Dec 2012 Thanks DUG , wahab. So is it possible to convert 12V(10A) to say 24V (2A) using some simple circuit? Any help appreciated. Thanks
 4th January 2013, 06:04 PM #5 DF96   diyAudio Member   Join Date: May 2007 Convert - yes. Simple - no. Google DC-DC converter. It will normally involve big capacitors or inductors, and semiconductor switches.
iinself
diyAudio Member

Join Date: Dec 2012
Quote:
 Originally Posted by DF96 Convert - yes. Simple - no. Google DC-DC converter. It will normally involve big capacitors or inductors, and semiconductor switches.
I purchased an assembled unit for \$4. Nice deal, works well.

 27th January 2015, 03:28 PM #7 DF96   diyAudio Member   Join Date: May 2007 I assumed DIY!
infinia
diyAudio Member

Join Date: May 2005
Location: SoCal
Quote:
 Originally Posted by DF96 I assumed DIY!

have you seen the prices of those things? you cant even DIY for that!
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 27th January 2015, 09:35 PM #9 sreten   R.I.P.   Join Date: Nov 2003 Location: Brighton UK Hi, It might be easier to use a car BTL type amplifier running off the 12V than doubling the 12V for a standard amplifier. The net result will be about the same, and the BTL won't need the output capacitor that 24V single rail needs. Car type BTL chip amplifiers are very mature. rgds, sreten.
DF96
diyAudio Member

Join Date: May 2007
Quote:
 Originally Posted by infinia have you seen the prices of those things? you cant even DIY for that!
True, but he did ask for a circuit - not a black box.

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