I had a look at that shield; I've used it's big brother before, the one that is rated to 12A, and if it's anything like that, it takes up way too many pins on the Arduino to be useful. I wish to use the micro controller to run two steppers simultaneously, which means I need four H-bridges, and I don't think I can get those boards to stack... I also need to be able to run microswitches into the Arduino to test for limits.
What I meant by Current Level Shifters was whether it was possible to use the lower current output of a cheaper H-bridge and run it to a device that would switch for higher currents. Chatting with a salesperson at Jaycar, it was suggested I could run the output of a cheap H-bridge into the gates of a series of MOSFETs to allow the motors to pull much higher currents than the H-bridge might be rated for.
However, considering I am using bipolar steppers, I figured that this would require 8 MOSFETs, one for each positive and negative currents per output. However, 8 MOSFETs will build 2 H-bridges anyway!
I haven't had a chance to test the design yet (I am relatively new at this), but would something like the following work? (drawn in Yenka, and clearly showing, for some reason, that it doesn't...) Circuit designed with NEMA 34 stepper such as aliexpress.com/item/4-lead-n ... 49277.html in mind.
Note 5.6A per coil!
Model needs a bit of work, as I can't seem to get it to provide anywhere close to 3A let alone 5.6...
Yenka also doesn't allow me to specify the Source and Drain pins of the MOSFETs, so I assume that the N-channels have Drain towards the 3V rail, and the P-channels have Source.
On the other hand, could a normal level shifter (for voltages) isolate motor coil currents in both directions from the H-bridge? If so, could a cheap H-bridge run into a level shifter to provide the currents required?