Homebrew PCBs

i always exposed the one, turned upside down, exposed other side.
i made a "pocket" of the film with a strip of pcb at the edge.
then developed/etched simultaneously.
didn't do much doublesided bards......

st





On Mon, 07 Jul 2003 09:10:21 -0000, Mark Farnell <farnell_mark@...> 
wrote:

> Is it necessary to expose both sides of a photosensitive PCB 
> simutaneously, so that I can dip the entire board into a sodium carbonate 
> tank?
>
> Otherwise if I expose one side first, I have to develop it immediately, 
> otherwise it will be overexposed.  However it would not be nice when I 
> have to dip the entire board (include the opposite side which is covered 
> by tape and not yet exposed) into the developing solution.  Also, it 
> would be messy if I spray the developing solution onto the exposed side 
> because the developing solution will still seep onto the unexposed side!
>
> Mark
>
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