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circuit diagram needed.

hi guys,
i want this circuit kindly suggest me circuit diagram
actually i want to run my computer's motherboard directly from car battery+charger,, so that i want this circuit,,
input voltages = 12v-14v and 40A(Car battery)
help plz,,

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Why are you trying to do this?

You are going to need quite a large 12V supply (15A or more) and this thing is going to get HOT. To be honest this looks exactly like a PC power supply output, why not use one of thos connected to the mains?
 
actually i want to run my computer's motherboard directly from car battery+charger,, so that i want this circuit,,
help plz,,
 
plz don't suggest me inverter of 12v-220v because it wastes so much energy,,

You are going to waste just as much, if not more than an inverter converting voltages down to 5 and 3.3V

Unless you purchase a massive one, you would onlt get a couple hours (at best) out of a car battery, efficiency would actually be about a 1:1 comparison (90% on a good inverter, 89-92% on regulators and things) and price would be significantly lower using an inverter (total around 100 for inverter and supply, vs upwards of 500 for parts)
 

davenn

Moderator
there are puter PSU's designed to run off a 12V battery, I have used them

go buy one

Dave
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Such as this.

That is just an example, not a recommendation.

edit:donkey beat me to it
 

davenn

Moderator
a circuit for a PSU like that is pretty complex and unless you are a very skilled technician ?, its probably out of your abilities

I personally wouldn't even bother trying to build one when they are so easy to buy

you are still better to buy a ready made unit from a computer shop or eBay or Amazon etc
I assume you have electronics stores or computer shops there ?
can you shop on eBay ?

here's just one of many examples available http://www.ebay.com/itm/MINI-ITX-DC...-/170930355978?pt=PCA_UPS&hash=item27cc3e3f0a

cheers
Dave
 
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