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#121
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half_pint wrote:
"David Maynard" wrote in message ... Lem wrote: "half_pint" wrote: And if you are saying that semi conductor devices are inherently sensitive to current then obviously we would make fuses out of them. However semiconductors are make out of silicone which has an extremly high melting point. (we are basically talking about sand) indeed silicone has replaced asbestos as a safer heat resistant material. Are you perhaps confusing silicon with silicone?` Welll prehaps you are, silicone is based upon silicon just as many semiconductors are based upon silicon. Silicone like semiconductors in ICs does not occur naturally however both are based upon silicon (or similar) and have very high melting points. Silicone is not based on silicon. There is almost no chemical or physical connection between the two. http://www.wordiq.com/definition/Silicone "Silicones, or "polysiloxanes", are inorganic polymers consisting of a silicon-oxygen backbone (...-Si-O-Si-O-Si-O-...) with side groups attached to the silicon atoms. Certain organic side groups can be used to link two or more of these -Si-O- backbones together. By varying the -Si-O- chain lengths, side groups, and crosslinking, silicones can be synthesized into a wide variety of materials. They can vary in consistency from liquid to gel to rubber." It can't be silicone without the silicon. It's paradoxical, however, to say 'silicone' has a 'high melting point' since silicones, depending on the formulation, can be anything from a liquid, to a gell, to a solid at room temperature. Well my Bettaware magazine is selling silicone mats for resting hot pans on. I would imagine it's made from one of the 'solid' formulations I mentioned. Which, of course, says nothing about the liquid or gel formulations. Nor, for that matter, does it necessarily say anything about the other, many varied, solid formulations. |
#122
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half_pint wrote:
"David Maynard" wrote in message ... Mike Tomlinson wrote: In article , David Maynard writes [snip pointless attempt to reason with half_pint] David, you're wasting your time arguing with half_wit. I'm beginning to see your point. Rather amazing, actually. I mean, even when one points to authoritative sources he simply declares everyone else ignorant or just plain dumb. Thats utter wank and you are a ******. I posted to you links on ESD damage and you proclaimed the people ignorant. Case closed. Makes me wonder how people like that arrive at their 'beliefs'. He's a regular poster on uk.legal, where the quality of his "advice" is on a par with his knowledge of electronics. I have him killfiled everywhere he pops up. |
#123
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If a surge was not due to lightning, then it would have
been one of those other often rare type of events - that the 'whole house' protector also would have protected from. One protector - properly sized - to protect all machines from the incoming surge. Or lots of undersized protectors, at greater costs, that only claim to protect from one all but nonexistent type of surge. Jonathan Buzzard guy is still trying to explain how impedance in wire and the inductance in a light bulb can create massive surges when power switched. Mains borne surges are why we use 'whole house' protectors that are properly sized and that typically cost tens of time less money per protected appliance. Jonathan Buzzard wrote: Cannot be, because according to w_tom such surges don't exist |
#124
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Of course not. I have no affiliation with any of those
companies. Why would I mention the competition so often? But this is basic and essential information when doing anything that requires reliable operation such as aerospace work and semiconductor factories. Ever see all computers damaged just before a space launch because the facilities were not properly earthed? Over the years, I have had some mysterious failures and spectacular successes. Most early lessons were on friends homes. Have seen MOVs completely vaporized so that only two lead exist - an eerie scene. Have seen everything - literally every electronic device - damaged except on one circuit protected by (what I now know to be) an undersized but properly located MOV. That MOV, earthed by less than three foot connection, shunted a surge so large as to partially damage the electric meter. All other circuits exposed to that strike suffered complete damage. This one protected circuit with such a short earth ground connection suffered not one failure - except where the surge passed through electric meter to get to earth ground. That one experience got me heavily into questioning surge protectors. Discovered myths all but promoted by plug-in protector manufacturers AND the highly rated products from real world protector companies such as Polyphaser. Tim Auton wrote: w_tom, do you work for a company involved in the manufacture, distribution, sales or installation of whole-house surge protectors? |
#125
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In uk.comp.vendors w_tom wrote:
damage the electric meter. All other circuits exposed to that strike suffered complete damage. This one protected circuit 'complete damage', as opposed to 'incomplete damage' no doubt. -- Chris Green |
#126
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In uk.comp.vendors w_tom wrote:
If a surge was not due to lightning, then it would have been one of those other often rare type of events - that the How the #@$£"&^ can something be "often rara"!? -- Chris Green |
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#128
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On Mon, 12 Jul 2004 21:55:21 +0100, half_pint wrote:
See above, if you handle computer components without observing ESD precautions you probably have, just you don't realize it. Well may conputer works just fine, I have touched the circuit boards many times whilst changing memory and drives etc... I dont wear an anti static band rtc.. It appears to be working perfectly well. You can ride a motorbike all your life without a crash helmet. Does not make it a sensible proposition. This is the realm of statistics, something that the general public seem to have a great deal problem understanding. You seem to be one. JAB. -- Jonathan A. Buzzard Email: jonathan (at) buzzard.me.uk Northumberland, United Kingdom. Tel: +44 1661-832195 |
#129
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"Jonathan Buzzard" wrote in message news On Mon, 12 Jul 2004 21:55:21 +0100, half_pint wrote: See above, if you handle computer components without observing ESD precautions you probably have, just you don't realize it. Well may conputer works just fine, I have touched the circuit boards many times whilst changing memory and drives etc... I dont wear an anti static band rtc.. It appears to be working perfectly well. You can ride a motorbike all your life without a crash helmet. Does not make it a sensible proposition. This is the realm of statistics, something that the general public seem to have a great deal problem understanding. You seem to be one. Well maybe you are one of the fools who think wearing a crash helmet will make jack **** of difference in 99% of mototcycle accidents. Worse still the false sense of security will probably mean you are more lilkely to end up dead or crippled. And you can add to that the fact that you senses of vision and hearing are severly diminished, makeing an accident even more likely. However don't let commonsense cloud you judgement, just stick to some really simplistic idea which you think you can understand. No point in taxing your brain too much. JAB. -- Jonathan A. Buzzard Email: jonathan (at) buzzard.me.uk Northumberland, United Kingdom. Tel: +44 1661-832195 |
#130
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"Cuzman" wrote in message ... "Lem" wrote in message ... " Am I being too complacent? " Think of this when you next take a ****. http://news.bbc.co.uk/1/hi/england/s...re/3457965.stm Hey Cuzman, the article was very interesting but I saw nothing relating it to lightning, but rather to a fault in HV cables beneath the public unit. |
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