> >
> > I made a 4 layer board by overlapping 2 2 layer boards. I needed
> > huge power traces and could not get them to the TSSOP chip and add
> > all the support caps and resistors. Simple square posts standoffs
> > carry the current.
>
> How did you contact the middle layer? with no throughhole plating?
>
> ST
Using the A3977 chip, I found that the power connectors are in the
corners and the ground n the centers And the supporting circuityr
was getting to be a PITA on a cramped board.
I just located 35 mil holes for 25sq pins. Soldered top and bottom
on the power board and then only soldered the accessable side on the
logic board
It did require both boards to be complete before assembling but it is
one way to put it all together.
I didn't want plugs or connectors, but next time I probably will.
Dave