Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

The problem with the eyelets was that they were tubular rivets. They solder
on the bottom and filled with solder. Unfortunately it often did not flow
over the top edge to reliably join the top trace.



That is why later rivets were used that had a slit in them and not tightly
crimped on the top . That way the solder wicked up and spread onto the top
trace.

Bertho



From: Bob Macklin Sent: Wednesday, January 02, 2013 19:41
I was an EE for over 40 years. And I remember the brass eyelet problem well.

But I think trying to simulate plated through holes on home made PCB is
going way too far.

I have been using wirewrap wire to fake the vias. I know you cannot put them
under components.

On real PCBs the plated though holds are made on each layer before etching.
Then the boards are sandwiched together.

This is just too much to try on homemade PCBs.

The sensitizing solution can be purchased and you can make real plated
through holes if you really need them.

But that's too much trouble for me. I only use the TT process to make small
quantities of boards for ham radio projects.

Bob Macklin





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