Songhe 3D Printer Parts DRV8825 Stepper Motor Driver Module with Heat Sink for Ramps 1.4 StepStick A4988 (5pcs)

Exactly what I was looking for, cheap boards but the ones I received were reliable. Using them to play with some NEMA 17s

Those are the real deal and work well. Packaging is a bit confusing since mine said A4988 on the bag, but the components were DRV8825s. The calibration screw is pretty sensitive and it can be hard to hit the current limit for 0.4A motors

Quality Drivers. All worked as intended!

They are not for the faint of heart, they will give the magic if you are not careful. If you touch it wrong with a screwdriver it will break. They get pretty hot, be careful, they do the job.

Ive tried all 5 drivers in the pack I got, 4 burned out very quickly, at any current setting, the 5th never worked at all. The heatsink gets hot almost as soon as you connect the power supply. One out of 5 has a defective potentiometer. Another, out of the box, has only 2 Ohms resistance between positive and negative voltage input. You can still adjust the current, but the end points have broken, so you never really know where you are. Ive checked with an expert in how to wire these, we set the current super low, hardly any holding torque on the motor at all as a result. Yet, best we got was a few minutes of action before the thing was burned out. At least for me, they dont work.

5 out of 5 were usable. I use a lot of these, so I know thats well above average in the DOA department. Packing is typical with several layers of bubble wrap and a soft envelope, got no bent pins this time. Each driver had its own anti-static bag, thats a plus. if youre new to these, be sure to turn the current-set pot all the way clockwise. Typically these come set to mid range, which is equivalent to about 2 or more amp which will lead to a thermal shut down in a few seconds. You can consult the tube to find out how to set power levels the tech way. Or if you are without a meter or just pragmatic, you can power up with a motor attached and some simple Arduino program delivering pulses. At first the motor wont move because youve set the current to 0 amps. Turn the pot counter clockwise SLOWLY. At some point (and it wont take much turning!) the motor will start to run. Pinch the shaft hard with your fingers and continue increasing the current until you just barely cant stall the motor. At that point you are likely to be at, or slightly below, the proper current rating for a middle sized NEMA 17 motor. Touch your fingertip to the NEG power connector to discharge any static. Gently touch your finger to the top of the chip...it should feel a little warm, but not hot! If its hot, reduce the current until you find some sweet spot balancing heat and motor performance. Best practice calls for using a heat sink, the ones that come with this kit are (typical of all kits on Amazon) kinda small, but better than nothing. The kit ones will let you set current about 0.1 amp higher than without. If youre really ambitious, but some tall heatsinks, sand of the anodize off the contact surface of the sinks to expose bare aluminum, and glue the sink to the chip with Arctic Alumina Thermal Adhesive, which is actually a two-part epoxy. It sets fully in about 15 minutes. That will let these drivers max out close to 1.9 or 2.0 amps without thermal shutdown, which is very impressive. And it will prevent the heatsink from shifting position which can happen with the spongy, peel off adhesive pads that come with the sinks. It just takes a tiny dab, grain of rice size or even smaller. A tiny dab will do ya, gramps. That stuff works really good, and although expensive one kit will do a LOT of heatsinks, so call all your friends for an upgrade party... wear masks please. PS, sometimes when adjusting current the driver will do a thermal shutdown. Dont despair, and dont toss it. Turn everything off, give it a 5 minute rest, and its good as new. PS, it is not entirely an old-wives tail that powering up these drivers without a motor attached will kill them. Be safe and dont tempt fate. And be darned sure youve got these things plugged in with the right orientation, the old 180 degree error is all too easy.

Arrived on time and as described.

They work well enough. Just be aware that every DRV8825 ever made has a slight hiccup. It is not noticeable in most cases. If used in a 3D printers extruder, however, they will create zebra stripes in the walls of your prints. As long as your application does not require extremely smooth movement, they will work fine.

Worked Great

In the past I purchased many of these cheap stepper motor controllers from a variety of sellers and gotten ripped up by receiving broken or cheap-quality modules that fall apart after integrating. With this seller, all of the pieces are I received were in excellent condition and the potentiometers on each piece were intact and resilient to adjustment. I am driving nema 17s at 2A 24v power supply I have had no issues and the product has functioned incredibly well for its price.