Brand new and quality assurance Model: A4988 red, A4988 green, TBS109, DRV8825, for makerbot Function: the driving module of the stepping machine Color: red, green, black, white Manufacturing process: SMT patch machine, non hand welding, higher quality, more stable performance A4988,for makerbot: 1, suitable for driving the stepper motor below 8V-35V 2A. 2. Only a simple step direction control interface. 3, five different step patterns: whole, half, 1/4, 1/8, and 1/16. 4. The adjustable potentiometer can give out the maximum current output to get a higher step rate. 5, automatic current attenuation mode detection / selection. 6, overheating closed circuit, undervoltage locking, cross current protection. 7, grounding short circuit protection and load short circuit protection. Note:A4988 Drive current: 2A For makerbot Drive current: 1A(only for makerbot) DRV8825: 1, the maximum current 2.5A. 2, the highest support 32 subdivision. 3, 4 layer PCB plate, heat dissipation performance is better. 4. The internal resistance of the chip is smaller, the heat is lower, and the heat dissipation is better. TBS109: 1, four layers of thick copper deposit PCB. 2, allow full step, half step, 1/4, 1/8, 1/16, 1/32 step. 3, maximum input voltage: 50V; maximum output current: 4A (requiring good heat dissipation). 4, equipped with super large radiator, can make the module get better heat dissipation effect. 5, high efficiency motor current control (advanced dynamic hybrid attenuation ADMD, ADMD technology can track closely the input current better than the traditional mixed attenuation mode, thus achieving the high efficiency motor control under high speed condition). 6, the chip built-in error detection circuit (thermal shutdown) (TSD), overcurrent turn off (ISD), and power on reset (POR), limit the current regulation (the current limit can be adjusted by measuring VREF and rotary adjustable resistor). Package included: 1*stepper motor drive moudle Note: 1, the product is sensitive to static electricity. Please handle carefully when using it. It is best to remove the package when it is used. 2, when the module is inserted into the main board, please confirm the installation direction carefully. The insertion may not be directly damaged or even damaged the main board at that time. 3, please turn off the power supply when inserting / pulling the module. Please do not insert the drive module when the main board is on power. 4, the module will be very hot at work to avoid touching at work so as to avoid burns. 5, when installing the radiating film, please ensure that the radiator does not contact with the module pin or any other conductive position.