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 with RAMPS or another similar FFF 3D printing platform, providing a quick alternative to similar solutions. Unlike market solutions, the ST820 helps customers take full advantage of microstepping solutions. Easily adjustable microstep resolution via jumpers: full step, 1/2, 1/4, 1/8, 1/16, 1/32, 1/128 and 1/256 steps Simple step and direction control interface . Current control adjustable via potentiometer to set ref. the tensions. Built-in PWM current control with selectable decay mode (fast or slow). specification: Size: 20x15x10mm Working 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 radiator Screwdriver 1 piece