I am looking to build a circuit that will allow me to switch the power and ground at any time. Meaning I need to design something that can switch its positive and negative output at any time. i.e. if I have a fan hooked up with positive and negative and the fan spins clockwise, I need to design something that can switch the positive and negative at will and then the fan would spin counter-clockwise (for example). Any and all help is greatly appreciated!!!!

 

use a dpdt, double pole double throw switch. the simplest way to do it.

 

Here you go.
http://www.robotroom.com/DPDT-Bidirectional-Motor-Switch.html
Centre off.
Max.

 

You guys are both awesome, thank you!

 

The presumes the fan motor will rotate in the opposite direction when the leads are reversed. Most won't.

 

And, if you need it, your switch should have a "center off" position

 

Most won't.

True for the ubiquitous PC fans that the OP is likely using. We know that old-fashioned two-wire brushed DC motors will reverse, but that's not likely what the OP has on his fan.

 

The fan was just an example fellas, to better illustrate what needs to be taking place

 

The fan was just an example fellas, to better illustrate what needs to be taking place

Do you want manual switching as suggested? There are other ways to accomplish the switching electronically. Whatever you choose, be sure the switch is rated for the load you are switching.

 

Sounds like it may not even be a fan, but if it is many are blade designed for maximum efficiency in one direction!,
Max.

 

Do you want manual switching as suggested? There are other ways to accomplish the switching electronically. Whatever you choose, be sure the switch is rated for the load you are switching.

What ways are there to do this electronically?

 

There are too many to list, without some detail about your specifications.
I've used a 4017 counter IC to get reversing polarity. You put the load between two of the outputs, such as the "0" and the "1". Both are never on at the same time, and are pulled to ground when off. So current goes one way on "0" and reverses on "1", and then you can reset on "2" if you like. This will handle only a few mA. A 555 timer can handle up to ~200mA. Beyond that you need an H-bridge.