I'm doing the synchro/resolver board and the top will be paved over with transformers. So a lot of parts will have to go on the bottom of the board. We usually space these boards off the the aluminum box with
0.25" PEMs.This is the sort of box we'll use:
The tallest parts will be electrolytic caps. So does it matter if the can touches the box?
I ohmed out a bunch of caps, both leads against the case. They seem to run in the roughly 10K to 100K range, wet lytics and polymers. I guess I should use longer PEMs.
I have a nice 1000uF 2.5V surface-mount polymer in stock, that is
0.31" high. So maybe use 0.375" PEMs. We could add some insulating tape if we get into trouble.