Building a R/C car...?

I have a Tyco Rebound 4x4 controller and circut board. all in working order, and intact. It is run on 6 volts, but i need to attach this to motors that run off of a seperate, 12 volt power supply. What would i need to put in between, so that the original tyco board will act as the middle man, telling somthing... show more I have a Tyco Rebound 4x4 controller and circut board. all in working order, and intact.

It is run on 6 volts, but i need to attach this to motors that run off of a seperate, 12 volt power supply. What would i need to put in between, so that the original tyco board will act as the middle man, telling somthing else, to tell my motors what to do. Help?
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