![]() ![]() You should have a diode across the coil and resistor (cathode on drain, anode on ground). Would there be another way to achieve what I am looking for, using those mosfets? Will the mosfet run fully on and fully off? Is this design acceptable? If so, what would be the optimal value for the gate-source resistor? With these mosfets, I would like to drive an unipolar motor not exceding 2A per phase and at a maximum of 2 kHz, I mean that each mosfets would switch on and off a maximum of 2000 times per seconds (1 kHz would be fine too). ![]() Please correct me if I am not right about what I said above. Leaving the gate floating is not possible. The resistor betwen gate and source is there to switch the mosfet off when 0 volt (ground) is not present. I am not familiar with PNP Mosfets but as I undrestand it, The ULN2803 will provide the Gate of the Mosfet with 0 volt (ground) or will be floating. I already tested the schematic below on a breadBoard and it is working. ![]() I have about 50 IRF9520 PNP Mosfets doing nothing so I would like to use a few of them for that purpose. Those drivers provide the logic feeding the ULN2803 with the full step sequence needed to run a small motor. I would like to add a bigger power stage to some of my stepper drivers that use ULN2803 as power driver for unipolar motors. ![]()
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January 2023
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