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Old computer power supplies are a great resource for ham radio gear, CB radios, chargers, or any other item that needs a regulated 12 volt source.  Many of these older power supplies do not have an on/off switch on the unit.  By tapping the green wire and any of the black wires on that connection plug that goes to the motherboard a standard switch can be wired in.  

Another benefit is that these supplies have several wired 12 volt and 5 volt outputs.  A custom supply with USB plugs and several cigarette-style receptacles could be constructed.

Be safe.  Have fun!

Thanks for watching.

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