Homebrew PCBs

I just checked a PCB that was tinned with Datak "TINNIT". There is no 
measurable resistance between adjacent traces.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message ----- 
From: "Alessio Sangalli" <alesan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Sunday, September 12, 2010 9:04 PM
Subject: Re: [Homebrew_PCBs] Re: Again on tinning!


> On 09/12/2010 11:36 AM, Malcolm Parker-Lisberg wrote:
>> It does deposit tin on the FR4 surface, and will prove problematic if you 
>> have high impedance circuits, it also causes problems when the board is 
>> conformally coated, with tin migration under the coating.
>> Conformally coating the board first and then applying the tin is a better 
>> solution for high impedace or low leakage PCB requirements.
>> It should not be a roblem with normal home PCB CMOS circuits.
>
> Do you have more data on this? This is chemistry, I am not qualified to
> understand the process for which the tin may deposit on the board, but:
> - is this measurable?
> - how much it changes a board? Can one see it with a multimeter?
> - do you have any kind of number or data?
>
> bye
> as
>
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and 
> Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>
>