mica capasitor

Apart from expensive high power ones, your best bet is salvage from old equipment !

Glass is an alternative, but again they tend to be quite expensive !

What value/values are you looking for and what voltage ratings ?

Furthermore mica is not necessary; mylar or polycarbonate capacitors do very well and 2% is fairly easy to obtain.

What value/values are you looking for and what voltage ratings

-------------------------------------------------------------------------------------------- Voltage : cca 500V F: cca 10 microF

Basicly i need high voltage capasitors ( "air" tuning capacitor for my resonance circuit (radio antenna )) If you have additional idea how to reach this thru some other capasitor design, let me know. There are some mica capasitors with 500V ~ 4000pF but i didn't test them.

Regards !

uuups typing error

------------------------------- cca 1 microF

Sounds like you want some old fashioned air spaced tuning caps from old radios. Usually 500pf per section ! Some have 3 or 4 sections. You could build your own !!

Sounds like you want some old fashioned air spaced tuning caps from old radios. Usually 500pf per section ! Some have 3 or 4 sections.

------------------------------------------------- Am 21 but yes, you can call me "old fashion guy" and yes im impressed with old radio stuff :-)) and yes you are totaly correct :-)). Do you know where to get such capasitor ?

You could build your own !!

--------------------------------------- Did you try to make one and if so then what have you used ( dialectric etc. ) ?

Thnx !

I've looked in old radios and TVs in the past and I've seen old mica capacitors. They're normally in the range 10pF through to 10nF. I have a suspicion that a 1uF/400V mica capacitor will be physically enormous and that no-one has ever made one commercially. What exactly are you trying to do with an RF antenna which requires 1uF capacitors? Why exactly do you want to use mica rather than mylar, polycarbonate, ceramic or any of the other materials which have superseded mica? Why stop at mica, you can make nice Leyden jars with a jam jar and some tinfoil....

Yes many times. 1/2 mm brass sheet and air dielectric. Last one went into a 1KW tuner flashes over above about 2KV though. Could do with an extra 0.25mm spacing !