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Summary of change:
'''Driver selection''' 14V/20Ohms = 0.7A capability with flyback If the two coils have independent magnetic paths (which I expect), low voltage flyback is the best. Either: * 2 free FET (TO220 or DPAK) with flyback. The injector FETs have flyback applied already: on this 6 cyl machine that would use the two remaining high power FETs if you use the injector drivers, none to spare for other functions. * or '''2 stepper channels''' (free anyway, seems like a good choice) - ''finally it has been choosen'' * or IGBTs. the IGBT-s have internal 400V clamping, but IMHO it's a bit rude to dump the coil energy in the IGBT. So I recommend to apply flyback diodes onboard if you choose this. (there are throughole pads for one end of the flyback diode at the IGBT) '''If the 2 solenoids have the same magnetic path''' ('''very unlikely''', only unipolar steppers have that), than high-voltage flyback (16V or above, 18..20V recommended) needed instead of low-voltage flyback: * FET is good, but with high voltage flyback. Throughole 18V transient suppression diodes are easy to mount for either the DPAK FETs or a free TO220 FET. ** if using the injector FETs with already applied low-voltage flyback, an SMB diode must be replaced with an SMB transient protection to get high-voltage flyback * SN754410 stepper chip is not sufficient, it has internal low-voltage flyback. L293 would work with external diodes, but we don't use it since v2 * IGBT is good, but high voltage flyback recommended.
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