Poul-Henning wrote:
Only thing to remember is that it also reduces air circulation in the box and therefore increases thermal gradients.
The starting point is a sensitive circuit, which I would put in a close-fitting, fully shielded box in any case. So even if it weren't quasi-hermetically sealed, there would still be essentially no exchange of air between the inside and outside of the box. In that respect, providing the moisture seal changes nothing. (I assume that by "air circulation in the box" you mean the exchange of air between the inside and outside of the box. Quasi-hermetically sealing an already tight shielded box would not change the air circulation *inside* the box.)
Further, a relatively close-fitting sealed box tends to minimize convection currents inside the box and to create an isothermal environment, avoiding the effects of drafts and circulation patterns that often plague sensitive circuits sharing a larger volume with other circuitry.
So, yes, as always, you have to think about heat flow, but quasi-hermetically sealing an already tight shielded box poses no additional complications. In fact, using a close-fitting sealed box tends to minimize thermal gradients inside the box.
Charles _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
