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Subject: Re: [Homebrew_PCBs] Re: Inkjet printing to make circuit stick to substrate

From: "Ron Amundson" <ron_amundson@...>
Date: 2004-03-22

> I don't know what to say about ionic contamination either, I have no
> idea what it is ;) How does it effect a board? Does it rot the
> FR-4?

Ionic contamination creates low impedance shorts all over the board.
Sometimes they will not exist when you first power the board up, but can
show up in a matter of hours. Low levels can cause clock drift, or
intermittent oscillator startup.

Very frustrating.....
Ron