Songhe TB6600 4A 9-42V Stepper Motor Driver CNC Controller, Stepper Motor Driver Nema tb6600 Single Axes Hybrid Stepper Motor for CNC 4pcs

Using on a homemade CNC and found them to work perfectly at a great value too.

Unit worked for Nema 17 motor attached to screw drive which actuated a syringe. I didn't need or want much power or speed so ran at 12V lowest current and microstepped 16..silky smooth and quiet. Drew about 125mA...I took a star off due to no documentation and the fact Enable logic is such that you must actively drive EN in order to stop it/disable.I looked at other copies of this and found some docs so proceeded with caution and found inputs can take 9 to 42 volts ,I didn't try over 16v, to drive optos either by sinking the cathode -, or driving anode+ to voltage.. there is some current regulation mechanism on inputs so you don't blow them up and don't seem yo need a dropping resistor..docs would be nice regarding this.If it doesn't turn in the direction you want one option is to swap one coils wires.I drove the pulse+ terminal with a 555 timer board at about 800Hz with 16 microsteping thats 800/16 steps per second and motor has 200 step/Rev so that's 0.25 revs per second. Screw was about 3 revs per inch so syringe travel about 1 inch per 12 seconds. Chose 12V because 555 timer could operate there and I had a small wall transformer outputting 12v at 500mA. Whipped up a small circuit with 3 diodes and an NPN transistor to add some logic to operate with two food pedals. I'll add a schematic later..my hand sketch isn't legible.

Tested w motor and works fine.

Delivers current needed for NEMA 17 4.5 bipolar stepper motor

still not hooked up but I have confidence

ordered two units JIC one was doa. both DOA. Both smelled like in a fire before, so tested with a known working circuit. both power on alarmed. Obviously their new inventory and their failure inventory mixed up. or POS.

I ordered the 4 pack of these TB6600 4A 9-42V controllers after ordering them in singles and receiving bad ones three times. I needed these particular ones for their physical size. I figured I'd get at least one good one, instead I got 4 DOA. I had the choice of a refund or a return for same item, but I've had one in my machine working for months so I foolishly opted to try again.Amazingly the next set of four all worked, the cases were slightly different though, indicating that they probably had a bad batch that they continued to sell anyway.If you have the time and patience to keep returning bad ones eventually you're probably going to get good ones like I did. thanks to Amazons user friendly return policy.When they work, they work good and the price/value is good.

I've been using them with Arduino boards for simple automation projects, and they seem to work well.