circuit diagram needed.

[Kaash]

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,,

 

[GreenGiant]

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?

 

[davenn]

................... To be honest this looks exactly like a PC power supply output, why not use one of thos connected to the mains?

totally agree

buy a computer PSU


Dave

 

[Kaash]

actually i want to run my computer's motherboard directly from car battery+charger,, so that i want this circuit,,
help plz,,

 

[Kaash]

plz don't suggest me inverter of 12v-220v because it wastes so much energy,,

 

[GreenGiant]

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]

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

go buy one

Dave

 

[donkey]

http://www.powerstream.com/DC-PC-12V.htm
these guys seem ok.

 

[(*steve*)]

Such as this.

That is just an example, not a recommendation.

edit:donkey beat me to it

 

[donkey]

yes but yours is much cheaper

 

[Kaash]

im from pakistan, i.e no ready made device available here,, thaty why in asking for circuit diagram..

 

[davenn]

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