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  • Users: Geoffster
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  1. Geoffster

    Trouble with second-source ULN2068 motor driver IC's.

    Allegro no longer make their quad darlington drivers ULN2068 amongst others. We use these to drive unipolar stepper motors driven from INTEL 8255 ports in full stepping mode with a 24v zener from the catch diodes to the 12V supply which is also connected to the centre of each motor winding...

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