Homebrew PCBs

> >
> > 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