To do this, I want to turn 3.3v to -3.3v for use in conjuction with 12v for around 15.3v
How?
Your ATX power supply is not able to provide enough amperage to charge a car battery, but u can make a trickle charger with it. For this, just find 12v cable and use a ground. U can use a 5 ohm 10 Watt power resistor on positive.
Hi so apart from being not enough voltage these switch mode power supplies have a tendancy to go faulty putting mains voltages on to a car battery so you would be some kind of idiot to do this. as 230volts on a car battery is a recipe for the battery to explode.
Not really practical as both those voltages will reference the 0V rail of the power supply. Trying to double them up with some reverse polarity will just let the magic smoke out.
Seriously it will be easier to build a power supply from scratch, and cheaper to just go a car parts store and buy one.
No. Don't do it. 14.4 is maximum charging voltage. Maybe 14.6 if it's really cold out. ATX is a computer, not a car.
I want to charge a car battery with ATX power supply.
To do this, I want to turn 3.3v to -3.3v for use in conjuction with 12v for around 15.3v
How?
