11 Sep
2012
11 Sep
'12
10:36 p.m.
On 11 Sep 2012 at 12:29, Chris Tofu wrote:
are you supposed to be able to tell just by looking at
them if they
have multiple layers? Assuming you have one w/multiple layers, and I
guess I already know the answer,
Hold the PCB up to a very strong light--many if not most multi-layer
PCBs have internal power or ground planes. This makes the PCBs
pretty much opaque--you can't see light shining through where the top
and bottom foil has been edched away. Vias that seeming disappear
into the PCB (i.e. no via visiable on the other side) are a pretty
good hint also.
--Chuck