low voltage silver mica capacitors (?)

warpie · Dec 11, 2009

Hi,

I'm looking for quality silver mica capacitors for some pF values.
I managed to find some but I'm really having hard time to find them with a voltage range no more than 65V.
Everything I've found are above 300V.
Actually these from rapidonline are rated at 500V

Any good place to find them?
I'm located in Uk but anything in europe would do.

thanks
w.

burdij · Dec 11, 2009

Is there a reason why you need to use the lower voltage type. Are the sizes of the higher voltage units too big?

warpie · Dec 11, 2009

well, not really. I know I can use higher voltage caps but somewhere in the forum I think
I read that if you are using them in low voltages circuits (like audio signals) you can have problems with crosstalk.
Is this true, or voltage range is not a problem at all (apart from the cap size)?

w.

burdij · Dec 11, 2009

I am not aware of crosstalk being related to voltage but I am not a real expert on capacitors. I think you would be safe using any voltage higher than what is specified. Silver micas are the "Cadillac" of capacitors and if you can use them (i.e. the values fall in the range you need as the values they come in are somewhat limited) I think they will perform well.

PRR · Dec 11, 2009

I don't know where "crosstalk" leaked in.

God made rocks which can be split: mica. A very thin low-cost split will block 500V. There was never any reason to split mica thinner than that.

Somewhere recently I did see <500V mica, but it was not clear if it was pure mica or mica-loaded plastic. I see no reason to find out.