--- In
Homebrew_PCBs@yahoogroups.com, "kilocycles" <kilocycles@...> wrote:
>
> John,
> Now we're getting there. I went to Mouser's site and checked on a
> capacitor I typically buy for construction of crystal filters in
> transmitters and receivers, the Kemet Golden Max series, which is
> monolythic ceramic, NP0/C0G. Lately I've used them in VFOs as well.
>
> I linked to the data sheets, and while they didn't specify K, Q or
> ESR, they did specify dissipation factor, which is the inverse of Q
> and therefore has ESR in its equation (I looked at another site for
> that). So, now when an application specifies high Q for a cap, I
> simply look at its dissipation factor. It's odd I didn't know that;
> I've used Q in other applications, obviously inductors, and in
> crystals themselves, but I'd just never thought about it in terms of
caps.
>
> I guess after close to 40 years in electronics, I haven't got all the
> dumbness out yet!
>
> Thanks,
> Ted
Who does? I have managed to shed a little by trying to answer
questions for others, about things I should have understood. I foten
find that I am vague about the details, till I try to formulate
explanations. Then I have to actually put the facts together.
Thanks for your comments on dissipation factor and capacitor data
sheets. Learning how to mine all the useful info from data sheets is
an art.