[sdiy] Dual ground planes

[David G. Dixon]

> my opinion: (ymmv)
> 
> Ground planes on the 'bottom' of the board are only useful if there are
> sensitive
> through-hole components on the other side. Unconnected grounds probably
> make things worse
> (imho) as they increase capacitive coupling and don't have any benefits.
> 
> Large ground areas on the bottom could make a circuit work better to some
> extent. Small
> areas are not worth the trouble imho.

Thanks for the frank response.  I'm going to start just using ground traces.
The large ground areas often don't transfer too well, anyway, particularly
around the edges of the board.