L298N as main chip, ST corporation production. Low heat, outstanding anti-interference performance. High working power to 46v, large current can reach 3A MAX and continue current is 2A, power to 25w. Can drive one 2-phase stepper motor, one 4-phase stepper motor or two DC motors. Built-in 78M05, get power from drive power, however, when drive power over12V, please use the external 5v power as power supply. Large capacity filters capacitance, after flow protection diode, more stable and reliable.