Chinese Stepper Expansion for Ramps 1.4

Has anyone used these chinese stepper expansion boards to add a 3rd extruder to Ramps 1.4?

chinese stepper expansion board

If so, can you share any pics, pinouts or wiring diagrams. Seems there is no documentation for these chinese boards.

Thanks
b

I think might be discontinued product. It shows 9V 1A rating, not exactly ideal for stepper motor driving.

I put in a search for bigtree-tech.com, ended up here, did a search for expansion, it doesn't show up (but lots of other interesting, more up to date kit does show up).

I don't see any single stepper expansions there, so maybe it's designed to fit in their other products, not actually in RAMPs as such. Not sure.

[www.biqu.equipment]

I found this identical circuit, but different markings. Keyes controller are more for Arduino than Ramps.

[www.aliexpress.com]

I saw this one on ebay [www.ebay.com]

Edited 1 time(s). Last edit at 08/09/2017 12:51AM by 3DLTech.