I need high voltage capacitors for a few projects and I'm finding that at this point it is easier to create my own than buy (and wait for shipping.)
This can be anything non-conductive. I've experimented with rubber and polyethylene so far. Considerations should include price, availability, dielectric strength and the dielectric constant of the material. Dielectric should be larger than the conductors. You'll need at least a top, bottom, and middle piece.
I've experimented with strips of aluminum foil and aluminum (?) metal tape so far.
Always need some leads for your new component!
To keep the wound capacitor together.
Along with working out processes for fabricating capacitors, I created some tests with aluminum tape and polyethylene dielectric (of varying thicknesses.) Capacitance measured between 2 and 3 nanofarads.
Still working out lead placement, orientation, etc.
Along the way, I created a little jig to assist with creation. Right now I'm just using the measurement sections, but I've been working on a tool at the top to assist with wrapping capacitors on the top left. Not sure if it will be hand wound or motorized.
Still trying to find the best way to affix the leads. Solder connections on the aluminum tape are not great. May be solved by dipping in sealant (wax, epoxy, resin) and drawing a vacuum on it to get rid of air.
I'll wrap up with some process pics.
Connections soldered and then covered in metal tape.