Homebrew PCBs

Just as an FYI, when I do use the tin, I do it after the solder mask.
So there aren't any traces to change the impedance.

But while were on the negatives.  :)

There are also cases where the tin plate grows whiskers over time and can cause a short later in life.  If you google for tin plating whiskers you'll see it.

--- In Homebrew_PCBs@yahoogroups.com, Malcolm Parker-Lisberg <mparkerlisberg@...> wrote:
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> Alessio
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> It does not short two tracks, but adds a high value of resistance between the tracks, more of a problem on low power digital and analogue systems.
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> Malcolm
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> I don't suffer from insanity I enjoy it!
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> --- On Fri, 8/20/10, Alessio Sangalli <alesan@...> wrote:
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> From: Alessio Sangalli <alesan@...>
> Subject: Re: [Homebrew_PCBs] Re: Now, tinning
> To: Homebrew_PCBs@yahoogroups.com
> Date: Friday, August 20, 2010, 5:27 PM
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>       On 08/20/2010 03:15 AM, Malcolm Parker-Lisberg wrote:
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> > Looks good, thanks, nice to know the formula works. One thing I found
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> > with electroless tin was that when used on PCB tracks on a high
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> > impedance circuit, was the tin seemed to coat the non-copper areas of
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> > the FR4 board and significantly reduce the impedance.
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> I am not a very "analog" guy because I think in terms of "short" or 
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> "open". What do you mean exactly here? Is the tinning "shorting" tracks?
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> My question at this point: we saw it works of a "solid" PCB, but how 
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> good is it on an etched circuit?
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> bye
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