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I am building an electrical circuit that requires a 12 volt power supply that i can get from a wall plug does anyone have any ideas. I have researched on google and Wiki and have not been able to find a plug that ends in two wires or how to use one that doesn't in a circuit. Any ideas? probally should have said that i went to radio shack right before i posted this.....thanks though
And got the following answer:
You need a 12 volt power supply that plugs into the wall (input 120 vac), and terminates into 2 bare wires (output 12 volts)? Just go down to Radio Shack and buy any 12 volt power adapter that terminates into two wires that can provide the proper current required for your circuit. I am sure you know whether you need AC or DC: just check your supply to make sure. If the adapter has some kind of plug on the end of it that has two wires leading to it, just cut the plug off, and voilà, you will have your adapter that ends in two wires. Look in the source section for an example of a 12 vdc power adapter that has the polarity indicated, that will provide up to 1.2 amperes of regulated 12 volt current, or about 14 watts of power, and which has a plug on it that you can cut off. Good luck! If the power supply you need is a 12 vac, just plug it in and go. If it is a DC circuit, a "12 volt power supply" will typically read something like this: INPUT: 120 vac OUTPUT: 12.5 vdc, or 13.8 vdc, or 14.4 vdc at x-amperes. Point is, if it is a DC circuit, anything from 12-14.4 vdc at an adequate current rating will be ok. One more important point about using a 12 vdc power supply. Verify the polarity! It most likely will be indicated somewhere on the adapter which wire is (+). Obviously, you will need to know this for a dc circuit. If you are not sure, you will need to verify the polarity with a multimeter. If you are at Radio Shack, they may have an open multimeter that you can use. Hopefully you have your own. Good luck!