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-   -   +12V (10A) and -12V (0.3A) rating supply question (http://www.diyaudio.com/forums/power-supplies/227003-12v-10a-12v-0-3a-rating-supply-question.html)

 iinself 4th January 2013 02:22 AM

+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

 DUG 4th January 2013 04:10 AM

Do you mean like 24V ct @ 0.3A ?

 wahab 4th January 2013 04:55 AM

Quote:
 Originally Posted by iinself (http://www.diyaudio.com/forums/power-supplies/227003-12v-10a-12v-0-3a-rating-supply-question-post3310214.html#post3310214) 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

 iinself 4th January 2013 02:48 PM

Thanks DUG , wahab.

So is it possible to convert 12V(10A) to say 24V (2A) using some simple circuit? Any help appreciated.

Thanks

 DF96 4th January 2013 06:04 PM

Convert - yes. Simple - no. Google DC-DC converter. It will normally involve big capacitors or inductors, and semiconductor switches.

 iinself 26th January 2015 02:51 PM

Quote:
 Originally Posted by DF96 (http://www.diyaudio.com/forums/power-supplies/227003-12v-10a-12v-0-3a-rating-supply-question-post3311136.html#post3311136) 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.

 DF96 27th January 2015 03:28 PM

I assumed DIY!

 infinia 27th January 2015 09:25 PM

Quote:
 Originally Posted by DF96 (http://www.diyaudio.com/forums/power-supplies/227003-12v-10a-12v-0-3a-rating-supply-question-post4201448.html#post4201448) I assumed DIY!

have you seen the prices of those things? you cant even DIY for that!

 sreten 27th January 2015 09:35 PM

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 28th January 2015 10:29 AM

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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