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- Newsgroups: sci.electronics
- Path: sparky!uunet!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!yale!gumby!destroyer!ncar!csn!yuma!gw214790
- From: gw214790@LANCE.ColoState.Edu (Galen Watts)
- Subject: Re: Handling CMOS
- Message-ID: <Dec12.183100.78190@yuma.ACNS.ColoState.EDU>
- Sender: Galen Watts, KF0YJ
- Date: Sat, 12 Dec 1992 18:31:00 GMT
- References: <Dec10.210537.30773@yuma.ACNS.ColoState.EDU> <1992Dec11.211003.22990@pts1.pts.mot.com>
- Nntp-Posting-Host: blanca.lance.colostate.edu
- Organization: Colorado State U. Engineering College
- Lines: 30
-
- In article <1992Dec11.211003.22990@pts1.pts.mot.com> more_da@pts4.pts.mot.com writes:
- >In article 30773@yuma.ACNS.ColoState.EDU, gw214790@LANCE.ColoState.Edu (Galen Watts) writes:
- >>The way I install CMOS chips is in the bathroom. Take the circuit board, all
- >>the tools you might need and the chips into the b-room and close the door.
- >>Run the shower on HOT for a few minutes, until the mirror fogs over. Leave the
- >>The idea is to use the high humidity to dissipate any static charges.
- >>
- >This isn't a flame or anything, but are you serious? Boy, am I glad I live in
- >sunny and humid South Florida, because I would hate to take a shower everytime
- >I play around with CMOS parts. :-)
- >I guess a simple ground strap doesn't suffice up there, huh?
- >
- Yes, totally serious. Currently (11:30 am), the temp here is -4c and the
- relative humidity reads around 4%. I don't have a humidifier in my heating
- system, but some around here do. You walk 10 feet across a carpet and touch
- the stove or a doorknob and you get a little zap. Petting the cat or dog in
- the dark gives quite a little electrical show, with different colored sparks.
- This can be enough to destroy a $20 CMOS chip and I don't take any chances.
-
- As for a ground strap, unless you spend real money for a real strap, they are
- pretty much worthless. I've worked for electronic manufacturers around here
- that use CMOS, and they blow about 3-5% of their chips on the assembly line.
-
- The low humidity may be a hassle in the winter, but when summer hits, (90-100F)
- it's nice and warm and virtually never "muggy".
-
- It works for me.
- Galen Watts, KF0YJ
-
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