No subject

[CGS2510 at CUB.UCA.EDU]

Shielding...
The material and geometry you use with the shielding is very 
important.  These can only be taken in context to what you are trying 
to shield though.  It is not necassary to use a very thick shield if 
the shield is silver and intended for optics.  The conduction of the 
material and the frequency of concern determines the rate at which a 
propagating wave attenuates through the material.  A very nicely 
shielded instrument I have is a WW2 radar reciever which uses 1/2 
inch thick cast copper as the shield (and chassis).  I would think 
that thick copper foil that is soldered along the joints would work 
quite well.  Perhaps making a chassis the same way but with fairly 
thick brass shims would be good too (and you get a chassis out of 
it).  Differential i/o and insulated-from-shield jacks are very nice. 
I usually find earth grounding the shield and letting it exist 
totally removed from everything else is satisfactory.  The power 
supply I use is a split supply that is ground isolated.