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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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silicone adhesive as electrical insulation?
sci.electronics.repair, rec.bicycles.tech
Leads from the cateye enduro's cyclocomputer body snapped off during an accident. I tried soldering the new length of magnet pickup wires following the epoxy? block covering the pickup's connection pins molded into the computer's bar mount AND then Gooping the wire's solder connections to the bar mount at the epoxy block Goop is silicone adhesive - Question is does the goop silicone provide electrical insulation at this low voltage flow? The computer stopped recording data after 3-4 miles. If the Goop is a no go what adhesive is durable and adequate insulation? What are cateye bodies made of and what adhesive works best there? |
#2
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silicone adhesive as electrical insulation?
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#3
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silicone adhesive as electrical insulation?
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#4
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silicone adhesive as electrical insulation?
In article . com, "Paul" wrote:
wrote: sci.electronics.repair, rec.bicycles.tech Leads from the cateye enduro's cyclocomputer body snapped off during an accident. I tried soldering the new length of magnet pickup wires following the epoxy? block covering the pickup's connection pins molded into the computer's bar mount AND then Gooping the wire's solder connections to the bar mount at the epoxy block Goop is silicone adhesive - Question is does the goop silicone provide electrical insulation at this low voltage flow? The computer stopped recording data after 3-4 miles. If the Goop is a no go what adhesive is durable and adequate insulation? What are cateye bodies made of and what adhesive works best there? Any silicone (RTV) that I've worked with is a good insulator when fully cured. I wouldn't be surprised if it is somewhat conductive before it is cured, but I never checked. I never apply voltage until it is fully cured. Rtv need not be capitalized. Goop is not silicone to me. Its more like a plastic. I use the different Goops, including Shoe Goo, and I am not going to claim it has no reaction to conections, but I don't think I have seen problems. If Goop is used in the sun, it should contain UV inhibitors like Marine Goop has. Goop is one of the strongest glues, but retains some flex. It takes several days for full cure. Silicone shuld have no conductivity, allthough it is not a vapor block, where Goop may have a good vapor lock. Electrical connections should be painted with enamel before applying silicone. greg |
#5
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silicone adhesive as electrical insulation?
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#6
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silicone adhesive as electrical insulation?
Paul wrote:
Any silicone (RTV) that I've worked with is a good insulator when fully cured. I wouldn't be surprised if it is somewhat conductive before it is cured, but I never checked. I never apply voltage until it is fully cured. Paul Standard GE RTV silicone contains acetic acid which can cause corrosion. They do make an electronic grade that is safe to use. I once used standard RTV to cover the line voltage terminals on a power transformer. I plugged it in before it was fully cured. This caused a small explosion.which was more exciting than it was dangerous. |
#7
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silicone adhesive as electrical insulation?
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#8
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silicone adhesive as electrical insulation?
wrote in message ups.com... I tried soldering the new length of magnet pickup wires following the epoxy? block covering the pickup's connection pins molded into the computer's bar mount AND then Gooping the wire's solder connections to the bar mount at the epoxy block Did you try Liquid Solder? |
#9
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silicone adhesive as electrical insulation?
wellll, i guess i'll do it over! "Wrong. Goop is a polypropylene/solvent adhesive. " does not goop write of goop as a silicone adhesive? long underwear from duofold is polypropylene, and excellent. thanks |
#10
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silicone adhesive as electrical insulation?
On Tue, 10 Oct 2006 18:53:08 GMT, Werehatrack
wrote: On 10 Oct 2006 10:33:21 -0700, wrote: [snip] What are cateye bodies made of I don't know; you would have to ask them. I'd expect it to be a filled resin of some sort, but there are many candidates with varying charcteristics. [snip] Dear Gloucester, If we're talking about the stuff inside that keeps the body of a cateye nice and round, it's known as the vitreous humor: http://en.wikipedia.org/wiki/Vitreous_humor Eye surgeons fear the escape of this vile jelly when removing a cloudy lens in a cat(aract) operation or any other surgery. "Losing vitreous" is worse than seeing an inflated tire start to creep off the rim at 120 psi--tubes, after all, can be replaced. So eye cutters try to keep the stuff pushed inside, where it belongs: "Cataract surgery was once a much more invasive and hazardous procedure than it is today. Large incisions and intracapsular lens extractions were not uncommonly associated with significant vitreous bulging and even vitreous loss. The situation is well described in the words of Dr. Paul Honan (1), whose account of the development of the Honan balloon can be found elsewhere in this issue of OASIS. Suffice it to say that ocular compression was born of the fear of losing vitreous during cataract surgery with its attendant complications resulting in visual compromise or loss. That fear exists to this day, especially when large incisions are required, as in corneal transplant surgery and during the occasional ECCE." http://www.eyeanesthesia.org/newsletter4.html As for repairing an ordinary cyclocomputer, the easiest solution is to stop by WalMart and get a new red $10 Schwinn cyclocomputer with a fresh battery and a trip meter that reads in increments of 0.001 miles. See you around, Duke of Cornwall |
#11
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silicone adhesive as electrical insulation?
On Tue, 10 Oct 2006 15:18:20 -0600, wrote:
On Tue, 10 Oct 2006 18:53:08 GMT, Werehatrack wrote: On 10 Oct 2006 10:33:21 -0700, wrote: [snip] What are cateye bodies made of I don't know; you would have to ask them. I'd expect it to be a filled resin of some sort, but there are many candidates with varying charcteristics. [snip] Dear Gloucester, If we're talking about the stuff inside that keeps the body of a cateye nice and round, it's known as the vitreous humor: http://en.wikipedia.org/wiki/Vitreous_humor My dear Duke: Perhaps you may have mistaken the less useful orb (once removed from its rightful place) for the more enjoyable one: http://www.tias.com/cgi-bin/google.f...Key=1922956560 Alas, once fractured, it is dashed difficult to heal with certainty through the employment of any glue made by mortal man, though the glass-blower's art might remold it somehow. As for repairing an ordinary cyclocomputer, the easiest solution is to stop by WalMart and get a new red $10 Schwinn cyclocomputer with a fresh battery and a trip meter that reads in increments of 0.001 miles. I am aghast! The mere concept of endorsing the use of a Red computer is anathema to any left-thinking cyclist, and there is no other kind with which it is permissible for those of good conscience to associate. And as has long been the case, the true gentleman will search long and hard to locate a computer whose figures are presented in the more seemly furlongs, a far more appropriate distance to use in judjing progress aboard something that is ridden astride a saddle, would you not agree? (Sadly, such devices seem in short supply, so a conversion table is often needed in order to make sense of the mundane indications available.) Yours, Gloucester -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
#13
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silicone adhesive as electrical insulation?
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#14
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silicone adhesive as electrical insulation?
wrote: If we're talking about the stuff inside that keeps the body of a cateye nice and round, it's known as the vitreous humor: (clip) ^^^^^^^^^^^^^^^^ Dear Carl, Your remark is vitreous humor humor. Jokes about glazed ceramics would be vitreous humor. Jokes about my first comment would be vitreous humor humor humor. |
#15
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silicone adhesive as electrical insulation?
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#16
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silicone adhesive as electrical insulation?
stupid question # 428
if silicones insulate electrical wires then what are silicone spark plugs leads (wires)? |
#17
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silicone adhesive as electrical insulation?
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#18
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silicone adhesive as electrical insulation?
spake thus:
stupid question # 428 if silicones insulate electrical wires then what are silicone spark plugs leads (wires)? The silicone is the insulator in them; the conductor is, usually, carbon-impregnated fiber of some kind (basically a big long resistor). -- Save the Planet Kill Yourself - motto of the Church of Euthanasia (http://www.churchofeuthanasia.org/) |
#19
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silicone adhesive as electrical insulation?
pow pow pow pow
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#20
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silicone adhesive as electrical insulation?
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#21
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silicone adhesive as electrical insulation?
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#22
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silicone adhesive as electrical insulation?
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#23
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silicone adhesive as electrical insulation?
"GregS" wrote in message ... In article , (GregS) wrote: In article . com, "Paul" wrote: wrote: sci.electronics.repair, rec.bicycles.tech Leads from the cateye enduro's cyclocomputer body snapped off during an accident. I tried soldering the new length of magnet pickup wires following the epoxy? block covering the pickup's connection pins molded into the computer's bar mount AND then Gooping the wire's solder connections to the bar mount at the epoxy block Goop is silicone adhesive - Question is does the goop silicone provide electrical insulation at this low voltage flow? The computer stopped recording data after 3-4 miles. If the Goop is a no go what adhesive is durable and adequate insulation? What are cateye bodies made of and what adhesive works best there? Any silicone (RTV) that I've worked with is a good insulator when fully cured. I wouldn't be surprised if it is somewhat conductive before it is cured, but I never checked. I never apply voltage until it is fully cured. By the way, I have applied HV before curing. it does well, but its probably better when fully curred.Thats the Type I silicone. greg Rtv need not be capitalized. Goop is not silicone to me. Its more like a plastic. I use the different Goops, including Shoe Goo, and I am not going to claim it has no reaction to conections, but I don't think I have seen problems. If Goop is used in the sun, it should contain UV inhibitors like Marine Goop has. Goop is one of the strongest glues, but retains some flex. It takes several days for full cure. Silicone shuld have no conductivity, allthough it is not a vapor block, where Goop may have a good vapor lock. Electrical connections should be painted with enamel before applying silicone. greg Speaking of HV, I can't imagine the voltages in the Cateye causing any significant electrical stress, and hence any voltage induced failures even without Goop or some sealant, as long as everything started clean and stayed clean. I could imagine an additional mechanical problem having lead to another open circuit due to the three miles of road vibration. In some such repairs I've tried, I've not been able to re-solder broken leads/pins with low enough energy to prevent additional damage. Two reasons for this: too cheap to buy the proper very-low power soldering system, and not proper skills for such delicate work. And this after having been certified to solder according to NASA standards! But nothing in spacecraft back in those days was as tiny as modern commercial electronics. Datakoll, I think something else in your Cateye has broken, and it might or might not be associated with your repair, based on what you've told us. Ken |
#24
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silicone adhesive as electrical insulation?
"Leo Lichtman" wrote in message ... wrote: If we're talking about the stuff inside that keeps the body of a cateye nice and round, it's known as the vitreous humor: (clip) ^^^^^^^^^^^^^^^^ Dear Carl, Your remark is vitreous humor humor. Jokes about glazed ceramics would be vitreous humor. Jokes about my first comment would be vitreous humor humor humor. This sounds like a joke from Rowan and Martin's Laugh-in. |
#25
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silicone adhesive as electrical insulation?
On Sat, 14 Oct 2006 21:01:15 -0400, "Road Man"
wrote: "Leo Lichtman" wrote in message ... wrote: If we're talking about the stuff inside that keeps the body of a cateye nice and round, it's known as the vitreous humor: (clip) ^^^^^^^^^^^^^^^^ Dear Carl, Your remark is vitreous humor humor. Jokes about glazed ceramics would be vitreous humor. Jokes about my first comment would be vitreous humor humor humor. This sounds like a joke from Rowan and Martin's Laugh-in. Dear Ken, By one of those odd coincidences, Dan Rowan was probably the most famous kid to come out of the McClelland orphanage down the street from where I live. Rowan was the one with the moustache and a fistful of medals as a fighter pilot. Cheers, Carl Fogel |
#26
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silicone adhesive as electrical insulation?
Werehatrack wrote: And as has long been the case, the true gentleman will search long and hard to locate a computer whose figures are presented in the more seemly furlongs, a far more appropriate distance to use in judjing progress aboard something that is ridden astride a saddle, would you not agree? (Sadly, such devices seem in short supply, so a conversion table is often needed in order to make sense of the mundane indications available.) My Cateye reads in furlongs if I set it to a calibration number of 1069. Alas, it still reads in decimals, not eights. More work is required. |
#27
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silicone adhesive as electrical insulation?
On Wed, 11 Oct 2006 10:47:36 -0700, David Nebenzahl
wrote: spake thus: stupid question # 428 if silicones insulate electrical wires then what are silicone spark plugs leads (wires)? The silicone is the insulator in them; the conductor is, usually, carbon-impregnated fiber of some kind (basically a big long resistor). Why don't spark plug leads get made out of metal, copper or whatever? Jasper |
#28
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silicone adhesive as electrical insulation?
In article , Jasper Janssen wrote:
On Wed, 11 Oct 2006 10:47:36 -0700, David Nebenzahl wrote: spake thus: stupid question # 428 if silicones insulate electrical wires then what are silicone spark plugs leads (wires)? The silicone is the insulator in them; the conductor is, usually, carbon-impregnated fiber of some kind (basically a big long resistor). Why don't spark plug leads get made out of metal, copper or whatever? They used to be. Might even be able to get racing wires. They generate a lot of RF interference. Using resistor plugs helped a bit in this case. greg greg |
#29
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silicone adhesive as electrical insulation?
On Thu, 02 Nov 2006 16:26:04 -0500, Meat Plow wrote:
On Thu, 02 Nov 2006 19:16:57 +0000, Jasper Janssen Has Frothed: On Wed, 11 Oct 2006 10:47:36 -0700, David Nebenzahl wrote: spake thus: stupid question # 428 if silicones insulate electrical wires then what are silicone spark plugs leads (wires)? The silicone is the insulator in them; the conductor is, usually, carbon-impregnated fiber of some kind (basically a big long resistor). Why don't spark plug leads get made out of metal, copper or whatever? They make lots of RFI. And they don't when they're made out of resistor wire? Huh. Weird. Jasper |
#30
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silicone adhesive as electrical insulation?
Jasper Janssen wrote:
On Thu, 02 Nov 2006 16:26:04 -0500, Meat Plow wrote: On Thu, 02 Nov 2006 19:16:57 +0000, Jasper Janssen Has Frothed: On Wed, 11 Oct 2006 10:47:36 -0700, David Nebenzahl wrote: spake thus: stupid question # 428 if silicones insulate electrical wires then what are silicone spark plugs leads (wires)? The silicone is the insulator in them; the conductor is, usually, carbon-impregnated fiber of some kind (basically a big long resistor). Why don't spark plug leads get made out of metal, copper or whatever? They make lots of RFI. And they don't when they're made out of resistor wire? Huh. Weird. Jasper No, not as much. The resistance built into the length of the lead chokes of the high frequencies that cause most of the interference ! -- Baron: |
#31
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silicone adhesive as electrical insulation?
Jasper Janssen wrote:
On Thu, 02 Nov 2006 16:26:04 -0500, Meat Plow wrote: On Thu, 02 Nov 2006 19:16:57 +0000, Jasper Janssen Has Frothed: On Wed, 11 Oct 2006 10:47:36 -0700, David Nebenzahl wrote: spake thus: stupid question # 428 if silicones insulate electrical wires then what are silicone spark plugs leads (wires)? The silicone is the insulator in them; the conductor is, usually, carbon-impregnated fiber of some kind (basically a big long resistor). Why don't spark plug leads get made out of metal, copper or whatever? They make lots of RFI. And they don't when they're made out of resistor wire? Huh. Weird. Its not wire. Its conductive carbon fibers. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#32
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silicone adhesive as electrical insulation?
On Tue, 07 Nov 2006 10:52:18 GMT, "Michael A. Terrell"
wrote: Jasper Janssen wrote: On Thu, 02 Nov 2006 16:26:04 -0500, Meat Plow wrote: On Thu, 02 Nov 2006 19:16:57 +0000, Jasper Janssen Has Frothed: The silicone is the insulator in them; the conductor is, usually, carbon-impregnated fiber of some kind (basically a big long resistor). Why don't spark plug leads get made out of metal, copper or whatever? They make lots of RFI. And they don't when they're made out of resistor wire? Huh. Weird. Its not wire. Its conductive carbon fibers. It's still wire. It's long and it conducts electricity, that's close enoough for government work. Who cares if it's not technically made out of metals. Jasper |
#33
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silicone adhesive as electrical insulation?
Jasper Janssen wrote in
: Its not wire. Its conductive carbon fibers. It's still wire. It's long and it conducts electricity, that's close enoough for government work. Who cares if it's not technically made out of metals. Sorry, the Compact Oxford English Dictionary disagrees: wire • noun metal drawn out into a thin flexible thread or rod |
#34
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silicone adhesive as electrical insulation?
On Sat, 11 Nov 2006 00:42:41 -0000, Jim Land
wrote: Jasper Janssen wrote in : Its not wire. Its conductive carbon fibers. It's still wire. It's long and it conducts electricity, that's close enoough for government work. Who cares if it's not technically made out of metals. Sorry, the Compact Oxford English Dictionary disagrees: Yes, I looked it up, that's why I formulated my post the way I did. So don't be redundant. Jasper |
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