Hi everyone.I have actually made a high voltage capacitor using aluminum foil (just 2 plates) and layers of Mylar. I have wrapped it and also it provides 17 nF.Now I want a bigger one and also I'm going to usage 10 layers of aluminum foil in parallel. The question is, when you use even more than 2 plates, have the right to you wrap it too?Thank you.Kind regards
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klugesmithHigh Voltage EngineerPosts: 385Karma: +12/-0
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By "Wrapping" do you expect rolling the plates and dielectric around a tube, choose brand-new aluminum foil?Sure, you can make a 10-plate stack and roll it up. Wouldn't you acquire the very same capacitance via a long 2-plate stack, made into a roll with even more turns?Same "efficiency", if all dielectrical layers have the very same voltage stress.That's just how commercial capacitors have actually been made for around 100 years.

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MRMILSTARHigh Voltage EngineerPosts: 337Karma: +10/-0Cedar Rapids, Iowa
A rolled capacitor might have significant parasitic inductance. Depfinishing on your application this might be a far-ranging consideration.
That's very dependent on wbelow the relationships to the foil are made, and also this is true whether the capacitor is rolled or level. If both relationships are made at the same finish then the currents cancel and also the only inductance results from the thickness of the dielectrical (a thicker dielectric leads to a bigger loop area). A very long length of foil will behave actually even more favor a transmission line, if the connections are at one finish.Commercially, rolled film/foil capacitors are constructed so the foils are exposed on either finish of the roll, and also connection is made throughout the entire endconfront.
I assume that you are referring to schooweb page. This is all very true for commercially-constructed capacitors. The problem is that the OP desires to make his very own rolled capacitor. I don't think the average residence builder has the capability of appropriately applying schooweb page to a rolled capacitor. Hence he's left via basic relationships to the plates of a rolled capacitor.
One means or one more, once rolling your own capacitor you need to connect to aluminum foil.It seems obviously straightforward to let each plate extend much past the dielectric on one end of the roll.

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But a couple of minutes of Internet looking didn't find DIY-ers connecting to the spirally exposed foil (for low inductance).Adam Munich missed that, in a job reported at Hackaday in 2011.Why not leave enough plate exposed to twist each end?
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Hello and also sorry for not respond! The university have actually started and with the virus everipoint is a mess!!Thank you for all your answers.The capacitor is only for fun and also experimenting.I have made a brand-new one through cellulose acetate (0,2mm) and also aluminium foil and also the capacitance is the very same once I wrap it.It provides 58 nf (a plate of 88x29 cm).Thank you and also sorry again
If you desire you might attempt mixing titanium dioxide via PVA glue and also paint it onto the plastic just prior to you wrap it.TiO2 has actually a consistent in between 80-450 depfinishing the resource which should rise the Farad.
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