🚀 go-pugleaf

In sci.electronics, ah335@cleveland.Freenet.Edu (Richard Banks) writes:



>a
>I have a plastic housing to put my circuit into but I'm worried about
>RFI interference.  I am going to try using aluminum foil, my question is
>how many layers do I need.  I know just one will not work. 

Why not? A complete lining of aluminum foil should actually work fairly well.
Don't leave gaps and make sure that the joints connect electrically.

>                                                              I remember
>from chemistry I when rutherford discovered electrons they passed
>right through one layer of aluminum foil, or was that gold foil?

Makes no difference- you are not in this case shooting electrons around anyhow
(or if you are you're doing something pretty wild in your little box!).
RFI typically results from EM radiation, not streams of electrons.

>At any rate could someone give me a good idea of how many layers to
>use to line the box with.   Thanks.  Richard Banks

A single layer should do just fine. Why not do simple experiment- measure
RFI with and without the shield? The effectiveness will be largely 
determined by the frequency of the interference.

Stan Bischof
Santa Rosa

********************************************************
These are just my own opinions and in no way should they
be confused with the opinions of my employer.
********************************************************