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how to create a cheap ac/dc converter


ruthless
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ac/dc converters are really expensive, and today i will show all of you monetarily challenged people how to make one cheap, maybe even free!

 

step one: buy or snatch a pc power supply from a computer. stealins wrong, mmkay? also, make sure its an atx power supply. non-atx power supplies have a different wiring setup. plus they have low amperage, which could damage your 12vdc electronics.

 

step 2: splice the green wire with any black wire. this will allow the power supply to come on without being connected to a pc. i suggest connecting it to a toggle switch.

 

step 3: the yellow wires are 12v positive and the black wires are grounds. there are also 5v and 3.3v rails you can use.

 

congratulations, you now have a ac/dc converter, and as an added bonus, the power supply is clean enough to use in scientific testing.

 

i suggest getting a rosewill psu from newegg.com prices start at 20 bucks.

 

and always remember to get a psu that is rated for at least 100watts over what you need. also keep in mind that a 12v power supply puts out 12 watts of power for every 1 amp @4 ohms.

 

good luck!

 

 

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Hi Ruthless, I don't get the 4 ohms?

 

Sounds like a loudspeaker impedance you are referring to?

 

R=V/I

 

so, for example: 12 volts divided by 1 amp would give a purely resistive load of 12 ohms.

 

12 volts with a current drain of 2 amps= 6 ohms... and so on.

 

Great idea though- PC supplies are usually very good, although some kick out crap and destroy radio reception on AM in particular. :)

 

Dave

 

 

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Actually what you are suggesting is called a power supply. A converter is a transformer and a bridge circuit. A power supply also has voltage regulators and splits the voltage up to 5 and 12 volts respectfully. I use modified pc power supplies to power my small projects. If you throw in a flyback with a 555 timer you can have a little more fun. Use that to power a tesla coil you can have lots of fun.

 

 

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