AW: AW: [sdiy] precision/matched capacitors??

[Czech Martin]

That's true. They even bake their circuits to get some
pre aging. Which cold also be a way to settle a vco.

The airgap really only works if it is dry.

m.c.

> I don't think air gap caps have REALLY good stability. I saw 
> one used once
> as a humidity indicator! (running a FM transmitter). It was 
> made of invar (a 
> metal that does not change dimension with temperature).
> I think those little ceramic NPO caps are pretty stable, temp wise.
> Often ham radio people rely on the opposite tempco of some 
> ceramics to cancel the opposite tempco of the inducance coil. 
> If you think diy-synth people are 
> fussy & obsessive, you havn't met the homebrew hams ;D
> 
> -paul perry Melbourne Australia
> -- 
> Message sent by Webmail from melbpc.org.au
>