+12V (10A) and -12V (0.3A) rating supply question - diyAudio
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Old 4th January 2013, 02:22 AM   #1
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Default +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
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Old 4th January 2013, 04:10 AM   #2
DUG is offline DUG  Canada
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Do you mean like 24V ct @ 0.3A ?
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Old 4th January 2013, 04:55 AM   #3
wahab is offline wahab  Algeria
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Quote:
Originally Posted by iinself View Post
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
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Old 4th January 2013, 02:48 PM   #4
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Thanks DUG , wahab.

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

Thanks
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Old 4th January 2013, 06:04 PM   #5
DF96 is offline DF96  England
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Convert - yes. Simple - no. Google DC-DC converter. It will normally involve big capacitors or inductors, and semiconductor switches.
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Old 26th January 2015, 02:51 PM   #6
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Originally Posted by DF96 View Post
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.
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Old 27th January 2015, 03:28 PM   #7
DF96 is offline DF96  England
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I assumed DIY!
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Old 27th January 2015, 09:25 PM   #8
infinia is offline infinia  United States
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Originally Posted by DF96 View Post
I assumed DIY!

have you seen the prices of those things? you cant even DIY for that!
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Old 27th January 2015, 09:35 PM   #9
sreten is offline sreten  United Kingdom
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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.
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Old 28th January 2015, 10:29 AM   #10
DF96 is offline DF96  England
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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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