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
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