Gikfun Motor Drive Shield Expansion Board L293D for Arduino Duemilanove UNO Mega R3 Ek7004 Motor Drive Shield Expansion Board L293D for Arduino Duemilanove UNO Mega R3 1 x Motor Drive Shield L293D L293D is a monolithic integrated, high voltage, high current, 4-channel driver?you can use DC motors and power supplies of up to 36 Volts, the L293D chip is also known as a type of H-Bridge?which is typically an electrical circuit that enables a voltage to be applied across a load in either direction to an output, e.g. motor. 2 interface for 5V Servo connected to the Arduino&#039;s high-resolution dedicated timer - no jitter. Can drive 4 DC motors or 2 stepper motors or 2 Servo. Up to 4 bi-directional DC motors with individual 8-bit speed selection. Up to 2 stepper motors (unipolar or bipolar) with single coil, double coil or interleaved stepping. 4 H-Bridges: per bridge provides 0.6A (1.2A peak current) with thermal protection, can run motors on 4.5V to 36V DC. Pull down resistors keep motors disabled during power-up. 2 external terminal power interface, for seperate logic/motor supplies. Tested compatible for Arduino Mega, Diecimila &amp; Duemilanove. Reset button.