Using a 5v PWM as control for beefier circuit?

[cjrautmann]

I am building an ROV using four 12VDC bilge pumps pulling 3.5 amps each. The controller I would like to use is a Make Application board, V2.0. This board has integrated PWM capability, but only at about 5v and 1 amp per motor.
Due to the design of the ROV, I need to be able to modulate and reverse the speed of each of the motors.
Is there any way to use the PWM off the control board as a controlling circuit for another circuit running 12VDC and 3.5 amps?
Thanks in advance!

 

[Sceadwian]

Sure, you just use the 'low' current PWM to drive current pass transistors that actually drive the motors.