Re: [CAD_CAM_EDM_DRO] Re: Cleaning Circuit Boards and "Static" rant

I'll have to disagree with you on this one based on actual experience.
I live in southern Colorado where the humidity level has gotten down to less
than 4%.

I have rugs through out the place I live in and we have gas heating. In the
winter, the static gets so bad, you get "good" shocks just walking across
the floor and turning on a light switch.

At any rate, I once blew out a modem AND a mouse because of static.!

Smoke
-----Original Message-----
From: Mariss Freimanis <geckohall@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Sunday, November 26, 2000 6:36 PM
Subject: [CAD_CAM_EDM_DRO] Re: Cleaning Circuit Boards and "Static" rant

>--- In CAD_CAM_EDM_DRO@egroups.com, "Wally K" <cnc4me@u...> wrote:
>> --- In CAD_CAM_EDM_DRO@egroups.com, "Wally K" <cnc4me@u...> wrote:
>> > To clean circuit boards i usally start with a air blast. Then
>put
>> > some rubbing alcohol in a spray bottle, spray board real good
>with
>> > alcohol and air blast again. Maybe repeat a few times. This
>> methode
>> > works ok and does leave streak marks on the board but its cheap,
>> easy
>> > and safe.
>> >
>> >
>> > Wally K.
>> >
>>
>> Wally K. replys.
>>
>> WARNING i do use this methode and it works ok for me...BUT i only
>do
>> it a few times a year and there is the possibility of building a
>> static charge with an air blast.
>
>Hi,
>
>Theoretically static discharge may be a problem, but so was the Y2K
>disaster we all were promised (does anyone remember that one?).
>
>I have practised my craft for over 20 years and I cannot say I ever
>saw a semiconductor damaged due to static discharge. In my opinion it
>fits in the same catagory as any number of urban legends; fun and
>frightening to recount, but short on factual specifics.
>
>Modern circuitry that could be susceptible are now well protected
>with intrinsic voltage clamping protection circuits. It is simply
>impossible to damage them unintentionally.
>
>I live and work in Southern California. The reason for telling you
>that is we here are subject to occaisional climate condtitions that
>result in relative humidity readings in the very low single digits.
>Static charge buildup during these conditions is impressive, yet no
>CMOS IC, MOSFET or other high input impedence device has ever died as
>a result. No special handling precaution has ever taken.
>
>Yet we get reels of 33 Ohm resistors carefully packaged in black
>electrically conductive, anti-static bags. A direct lightning strike
>would not damage these parts, but there they are in their protective
>bags. Go figure.
>
>This is a solution in search of a problem. It is an unecessary
>precaution to the cautious and a ready excuse for the inept designer
>to his customers excuse to his sorry work. "Yeah, it was static
>discharge why the (fill in the blank) circuit died".
>
>End of rant.
>
>Mariss
>Geckodrive Inc.
>
>
>
>
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