Manhattan-style pad capacitance

[Jack Smith-6]

Geoff, GM4ESD, has asked the relevant question "how much shunt
capacitance is present in a PCB island" when cut with a core drill?

I've tried to answer that question with a combination of theory and
measured data, which are in close agreement. The details are at
http://www.cliftonlaboratories.com/Prototyping.htm#Island_Pad_Prototyping.
You can read the entire page, or jump to the capacitance discussion via
the in-page link.

The short answer to the questions is "some" and whether "some" is too
much depends on a variety of things discussed in the analysis. I will
say, however, that the data has caused me to reconsider using the very
thin 0.029" PCB stock for work at higher frequencies, as convenient as
it may be for cutting and hole punching.

Jack K8ZOA

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[Jack Smith-6]

The link I posted has a direct jump to bookmark and might cause some
browsers a problem.  The main prototyping page is at
http://www.cliftonlaboratories.com/Prototyping.htm and might be a better
starting point.

Jack K8ZOA


Jack Smith wrote:

> Geoff, GM4ESD, has asked the relevant question "how much shunt
> capacitance is present in a PCB island" when cut with a core drill?
>
> I've tried to answer that question with a combination of theory and
> measured data, which are in close agreement. The details are at
> http://www.cliftonlaboratories.com/Prototyping.htm#Island_Pad_Prototyping.
> You can read the entire page, or jump to the capacitance discussion
> via the in-page link.
>
> The short answer to the questions is "some" and whether "some" is too
> much depends on a variety of things discussed in the analysis. I will
> say, however, that the data has caused me to reconsider using the very
> thin 0.029" PCB stock for work at higher frequencies, as convenient as
> it may be for cutting and hole punching.
>
> Jack K8ZOA
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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