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I'm designing a PCB for motor control. But my Proteus is not working and it doesn't show these errors that I don't understand (view last photo).

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    \$\begingroup\$ Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. \$\endgroup\$ Commented yesterday
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    \$\begingroup\$ Proteus won’t show you the mistake. You designed the circuit and Proteus will simulate it. Does the simulation match your expectation? If not, narrow down the section, then instrument it. \$\endgroup\$ Commented 22 hours ago
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    \$\begingroup\$ The voltages (notations in blue) are not readable ... \$\endgroup\$ Commented 20 hours ago
  • \$\begingroup\$ The error is coming from the block at the bottom right with the LM393N. The motor is supposed to rotate, but it doesn’t, even though I have voltage on the control input of the H-bridge.I followed every signal in the schematics, and each block works correctly on its own. What should I do next? The blue input indicates 12 V for the schematic to operate. \$\endgroup\$ Commented 20 hours ago
  • \$\begingroup\$ I suppose that the LM393 work is to "measure" the current of the motor. You should perhaps "test" the load (motor + serial resistor) while "locking" the LM393. Use a supply with limited overcurrent. Note also that LM393 is open collector. Maybe you missed the resistor on the right bottom of the comparator (don't see well). \$\endgroup\$ Commented 20 hours ago

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I have simulated with microcap v12 the "overload" circuit.

It seems to be working ok ... but I don't know the load current.

I just changed the value of RV4 to 10 kOhm (b actual value : 0.5..0.9, * 10 kOhm).
Forget the value of b in the picture, it is varied from 0.5 to 0.9, step 0.2.

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You can change the values of three variables (pw, b, a).

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  • \$\begingroup\$ Thank you so much for your help .I appreciate it a lot . Then , what is the matter it is still not working on Proteus . Should I use another simulation tool? \$\endgroup\$ Commented 17 hours ago
  • \$\begingroup\$ Begin with shorting R35. Then test all other parts to seeif they are working. You can continue with Proteus if you feel "good" with it. \$\endgroup\$ Commented 16 hours ago

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