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[PCB Prototype] Difference between Via filled with resin and Via filled with copper

What is the difference between Via filled with resin and Via filled with copper?Why I can't select via filled with copper on the website for my PCB?
3answers

[Others] Will the bottom resistor work as a replacement for the top one?

Can anyone explain the difference between these two resistors? And what's the difference between J and F?
2answers

[Others] The difference between PMSM and BLDC speed control

The speed of the PMSM is controlled by varying the frequency of the three phase signals that go to the motor windings, but the BLDC motor’s speed is controlled by varying the voltage amplitude. Why is...
  • answered Oct 15,2020
    by Kemio
1answers

[Others] Can anyone explain the difference between simulation and emulation

I get confused about the meaning of simulation and emulation.Could anyone explain the difference in terms of programming? What is the difference between these two terms? Thanks
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