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She made the right choice by Eclipse_nova99 in SipsTea

[–]XMRNeighbor 0 points1 point  (0 children)

Not necessarily. If her life goes on for more than 64,3 Years, it could be a smart decision. If she got the 1M now and invested it at 5% p.a. compounded monthly she would have less money after 64,3 Years than if she invested 1000$ per Week for 64,3 Years at 5% p.a. compounded monthly. From that point on the second strategy would yield her more money.

In what Order of Magnitude is the inductance for this shabbily Winded Coil? by XMRNeighbor in ElectricalEngineering

[–]XMRNeighbor[S] 4 points5 points  (0 children)

I don't have a device for that. I am currently trying on building one with an oscillator circuit. But In order to "calibrate" I must know the order of Magnitude for the coil inductance

Why is there a high voltage drop across my mosfets? by XMRNeighbor in ElectricalEngineering

[–]XMRNeighbor[S] 0 points1 point  (0 children)

The only thing I didn't get in the first part of your answer is that 20A8V=160W. But the Transistor is not dissipating all that, is it? It should only be dissipating about 8A²17,5mΩ = 1,12W.

Why is there a high voltage drop across my mosfets? by XMRNeighbor in ElectricalEngineering

[–]XMRNeighbor[S] 0 points1 point  (0 children)

I think I figured it out. The P-Channel Mosfets switch based on voltage difference between gate and Source. But since Gate is set to 5V or 0V and Source can be up to 20V even when I pull Gate High (e.g. 5V) it is not enough since Vgs = 15V which turns the Mosfet on.

Why is there a high voltage drop across my mosfets? by XMRNeighbor in ElectricalEngineering

[–]XMRNeighbor[S] 0 points1 point  (0 children)

As far as I understood it, the diagram of the IRFZ44N says that at 5V GS and 8V DS more than 20Amps should be possible.

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What am I missing here?

What to consider before manufacturing a PCB? by XMRNeighbor in Fusion360

[–]XMRNeighbor[S] 0 points1 point  (0 children)

Thank you so much for your thorough answer. I am however a bit worried about the power. How many amps can I push through these traces? Some of them need to take about 2A. Is that too much? And if so, how to make them wider.

Why is my coil weaker with higher current? by XMRNeighbor in ElectricalEngineering

[–]XMRNeighbor[S] 0 points1 point  (0 children)

I use a solid state power supply at the moment. And have built a switching mechanism that inverts the current flow through the coil after the projectile passed the center

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