Description: The ST820 is an easy-to-use driver board for 3D printers, routers and more. A compact solution for stepper motor drives with minimal external equipment, no additional components required. The hardware is fully compatible for RAMPS or other similar FFF 3D printing platform, representing a quick to similar solutions. Unlike market solutions, the ST820 helps customers truly take advantage of high-microstepping solutions. Microstep resolution easily settable through jumpers: full-step, 1/2, 1/4, 1/8, 1/16, , 1/128 and 1/256 of step. Simple step and direction control interface. Adjustable current control through a potentiometer to set the ref. voltages. Embedded PWM current control with selectable decay (fast or slow). Specification: Size: 20x15x10mm Operating voltage: 7V - 45V Continuous current: up to 1.5A per phase Maximum current: up to 2.5A per phase Package Includes: 1 Piece ST820 Driver 1 Piece Heat Sink 1 Piece Screwdriver