piclist 1999\04\15\084527a >
Thread: Pcb VIAS
face BY : Barry King email (remove spam text)

> When you get you design back from the electronics shop, do you
> have to put solder in the vias also?
> I had the pcb drilled and tinned in the shop already, but I
> get the feeling that there is no solder (through) in the vias !!
Normally, all the holes on double sided PCB are plated through,
connecting the top and bottom side traces.  However, some simple,
cheap prototyping systems, including the popular home PCB systems
don't provide this, so you have to solder through all the vias.

Its easy to tell:  Use your ohmmeter (you do have an ohmmeter, I
hope) to see if an example trace is connected top to bottom.

If not, don't panic.  Two things to do on these kind of boards.

1) First solder a piece of wire into every via (the ones that do not
get a component lead) and make sure it is soldered top and bottom.
You won't automatically get good flow through, so check it on both
sides.  Then trim them a flat as practical before adding components.

2) Make sure that you solder the top and bottom of the component
leads.  If a lead has a trace to only the solder side, you don't
have to solder the top, but I usually do anyhow.  There are some
components where its hard to reach the top side pads.  Examples:
Radial lead capacitors, and metal can transistors.  I usually leave
them slighty up off the PCB so I can readch under with the
soldering iron.

Hope this helps.

Barry King, KA1NLH
Engineering Manager
NRG Systems "Measuring the Wind's Energy"
Hinesburg, Vermont, USA
"The witty saying has been deleted due to limited EPROM space"


In reply to: <000301be8737$241a3180$bf06703e@goovaerts-glen>
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