Frustrated by those cheap, low-voltage motors that require too much current? Here’s the answer: a low-voltage motor controller designed specifically for those toy motors. With all of the convenience of the Pololu dual serial motor controllers and the added ability to deliver 5 amps per motor with no minimum motor voltage, this dual serial motor controller has you covered.
Specifications:
Motor ports: 2
Speeds: 127 forward and backward, brake
Max current: two motors 5 A each, one motor 10 A
Motor voltage: 0 - 7 V
Logic voltage: 3 - 5.5 V
PWM frequency: two motors 600 Hz, one motor 750 Hz
Serial baud rate: 1200 - 19200 (automatically detected)
More info:
http://www.pololu.com/catalog/product/120"