This is a fully compatible re-designed stepper driver for the MakerBot Replicator 1 and Replicator 2/2X. These are made to drive any stepper motor (like NEMA17 type motors), in either full, half, quarter, or sixteenth micro-step resolution. The foot print is similar to other A4988, DRV8834, or DRV8825 based boards.
Thermal design has been improved to make it run cooler and easier to attach heatsink. All the components follow MakerBot specifications or better to make this a reliable drop-in replacement - no need to tune hard-to-get-to potentiometers or other tweaks like on similar boards.
The Vref voltage is found using the formula: Vref = Imax x 8 x Rsense, where Imax = max. driving current, Rsense is the sensing resistor value (0.27 Ohm).
These drivers are hard to come by after 2015, when MakerBot Industries stopped making them.
The MightStep17 driver is based on the original A4982 stepper motor driver chipset which used on the MakerBot and is current limit programmable from the MakerBot MakerWare application. It uses the same 0.270 Ohm sensing resistor to make the current scale the same.
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