mica capasitor

M

mark2006

Guest
Hi !
Im making some project with antenna and i need mica capasitor ( there
are other options but i will use this one ). Does someone knows where i
can get such capasitor (in Europe) ?

Thnx !
 
mark2006 wrote:

Hi !
Im making some project with antenna and i need mica capasitor ( there
are other options but i will use this one ). Does someone knows where
i can get such capasitor (in Europe) ?

Thnx !
Click to expand...
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 ?

--
Baron:
 
Baron wrote:
mark2006 wrote:


Hi !
Im making some project with antenna and i need mica capasitor ( there
are other options but i will use this one ). Does someone knows where
i can get such capasitor (in Europe) ?

Thnx !


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
Click to expand...
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 !
 
mark2006 wrote:

uuups typing error
F: cca 10 microF
-------------------------------
cca 1 microF
Click to expand...
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 !!

--
Baron:
 
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 !
 
In article <jGy3h.3440$ig4.3049@newsread2.news.pas.earthlink.net>,
Robert Baer <robertbaer@earthlink.net> wrote:

Baron wrote:
mark2006 wrote:


Hi !
Im making some project with antenna and i need mica capasitor ( there
are other options but i will use this one ). Does someone knows where
i can get such capasitor (in Europe) ?

Thnx !


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.
Click to expand...

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....
 
mark2006 wrote:

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 !
Click to expand...
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 !

--
Baron:
 
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