Types of motor controllers that can handle 3A+

Using Arduino Motors, Mechanics, Power and CNC
7

MarkT:

tawandapro:
should i just use the ESC'S that i am using on the 4wd rover instead? The pololu ones are pricey plus the postage will drain my budget

No idea - what kind of ESCs are they, brushless or brushed? I presume your gear motors will be brushed from the discussion
above but you haven't given details of the existing set-up.

They are brushed esc's and brushed 540 motors. The esc is this kind
http://www.ebay.com.au/itm/New-320A-Speed-Brushed-Controller-ESC-1-8-1-8-1-10-RC-Car-Truck-Buggy-Boat-/110933808971?pt=AU_Toys_Hobbies_Radio_Controlled_Vehicles&hash=item19d42b974b

I am using the servo library to control the esc's the signal wire is connected directly to the pwm pins in the arduino uno i have and i have controlled them arduino just backward forward motion.