thir13enth
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The problem is that you need a gate voltage that is higher than the source pin and when the mosfet turns on the source pin will have almost the same voltage as the drain (12v) so your Vgs bias will be almost 0 (12v gate, 12v source).
Thank you for your time.
I tried to isolate the motor source (12V) and the gate source (14V) and did the second picture on your post, yet the upper bridge is still switching simultaneously.
Now your control problem, I assume that you wanted to connect all cathodes to the enable line and then two diagonal anodes (Q1/Q4) to one direction and the other two (Q2/Q3) to the reverse direction, it should solve your problem.
I guess you'll have to make the real circuit to understand what we are talking about.
Alex
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