http://tinyurl.com/nxyahu5
SODIAL(R) DC 12V-36V 5A Motor Speed Control PWM Controller
Working Voltage: 12V - 36V DC
Rated Current: 5A
Max. Current: 10A
Frequency: 25KHZ
Board Size: Approx. 2.36 x 1.57 inch (60 x 40 mm)