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#31
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Tip: blowing out fans
default wrote:
On Tue, 12 Nov 2019 14:55:44 -0800, T wrote: On 11/12/19 5:55 AM, Jonathan N. Little wrote: T wrote: That would definitely be part of the design. It is okay to spin the fan a little, just don't exceed by much what it is designed to spin at. Some Air Compressors can make that fan spin so faat, the computer is about to take off! And yes, it is fun. Resist the urge! I finally found 60, 92 and 120 mm PWM fans I like. A simple solution when blasting to remove stubborn crud on blades is a finger on the fan BEFORE blasting away. With canned air, that can get pretty cold! I put my plastic ball point pen in them. The stuff is cold because they use refrigerants. In fact there's several DIY Utoobe vids of shade tree mechanics using "Dust Off" products to recharge auto AC units because it can cost less. (and they sell a side-piercing aerosol can tap for the purpose) The danger to a computer might be from the cold - particularly if it condesnses water from the air, causes thermal stress on connections, or is powered up at temperatures it was not designed for. And it is so, so much fun to see the blades whirl. Damn that self control thing! Well, there is that. Entertainment value. The only part in a computer with a significant exposure from "freeze mist", is a "DIP EPROM with window". We killed a few of those, while doing thermal testing on the bench. I don't remember other parts having a problem with that sort of testing. The material in the cans, was a freon-like product, and the surface temperature achieved was around -55C or so. If you thought a particular hardware interface had marginal timing, you could use freeze mist to check. It's human nature, to get carried away with that stuff. It eventually disappeared from the market, that particular product (Chemtronics, white spray can). And windowed EPROMs were replaced with EEPROMs instead, the electrically erasable ones. No more putting batches of them in the UV eraser. I programmed quite a few of those by hand in the lab. And adiabatic expansion of gases, while generally having a cooling effect... https://lecdem.physics.umd.edu/i/i5/i5-15.html that isn't always the case. I was going to use hydrogen as an example, but hydrogen apparently has multiple things working against it. Who knew... Keep these in mind, when you see the new hydrogen-powered cars in the showroom. https://www.eng-tips.com/viewthread.cfm?qid=51712 Paul |
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#32
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Tip: blowing out fans
On 2019-11-13 2:17 p.m., Paul wrote:
default wrote: On Tue, 12 Nov 2019 14:55:44 -0800, T wrote: On 11/12/19 5:55 AM, Jonathan N. Little wrote: T wrote: That would definitely be part of the design. It is okay to spin the fan a little, just don't exceed by much what it is designed to spin at.Â* Some Air Compressors can make that fan spin so faat, the computer is about to take off! And yes, it is fun.Â* Resist the urge! I finally found 60, 92 and 120 mm PWM fans I like. A simple solution when blasting to remove stubborn crud on blades is a finger on the fan BEFORE blasting away. With canned air, that can get pretty cold!Â* I put my plastic ball point pen in them. The stuff is cold because they use refrigerants.Â* In fact there's several DIY Utoobe vids of shade tree mechanics using "Dust Off" products to recharge auto AC units because it can cost less.Â* (and they sell a side-piercing aerosol can tap for the purpose) The danger to a computer might be from the cold - particularly if it condesnses water from the air, causes thermal stress on connections, or is powered up at temperatures it was not designed for. And it is so, so much fun to see the blades whirl. Damn that self control thing! Well, there is that.Â* Entertainment value. The only part in a computer with a significant exposure from "freeze mist", is a "DIP EPROM with window". We killed a few of those, while doing thermal testing on the bench. I don't remember other parts having a problem with that sort of testing. The material in the cans, was a freon-like product, and the surface temperature achieved was around -55C or so. If you thought a particular hardware interface had marginal timing, you could use freeze mist to check. It's human nature, to get carried away with that stuff. It eventually disappeared from the market, that particular product (Chemtronics, white spray can). And windowed EPROMs were replaced with EEPROMs instead, the electrically erasable ones. No more putting batches of them in the UV eraser. I programmed quite a few of those by hand in the lab. And adiabatic expansion of gases, while generally having a cooling effect... https://lecdem.physics.umd.edu/i/i5/i5-15.html that isn't always the case. I was going to use hydrogen as an example, but hydrogen apparently has multiple things working against it. Who knew... Keep these in mind, when you see the new hydrogen-powered cars in the showroom. https://www.eng-tips.com/viewthread.cfm?qid=51712 Â*Â* Paul On 2019-11-13 2:17 p.m., Paul wrote: default wrote: On Tue, 12 Nov 2019 14:55:44 -0800, T wrote: On 11/12/19 5:55 AM, Jonathan N. Little wrote: T wrote: That would definitely be part of the design. It is okay to spin the fan a little, just don't exceed by much what it is designed to spin at. Some Air Compressors can make that fan spin so faat, the computer is about to take off! And yes, it is fun. Resist the urge! I finally found 60, 92 and 120 mm PWM fans I like. A simple solution when blasting to remove stubborn crud on blades is a finger on the fan BEFORE blasting away. With canned air, that can get pretty cold! I put my plastic ball point pen in them. The stuff is cold because they use refrigerants. In fact there's several DIY Utoobe vids of shade tree mechanics using "Dust Off" products to recharge auto AC units because it can cost less. (and they sell a side-piercing aerosol can tap for the purpose) The danger to a computer might be from the cold - particularly if it condesnses water from the air, causes thermal stress on connections, or is powered up at temperatures it was not designed for. And it is so, so much fun to see the blades whirl. Damn that self control thing! Well, there is that. Entertainment value. The only part in a computer with a significant exposure from "freeze mist", is a "DIP EPROM with window". We killed a few of those, while doing thermal testing on the bench. I don't remember other parts having a problem with that sort of testing. The material in the cans, was a freon-like product, and the surface temperature achieved was around -55C or so. If you thought a particular hardware interface had marginal timing, you could use freeze mist to check. It's human nature, to get carried away with that stuff. It eventually disappeared from the market, that particular product (Chemtronics, white spray can). And windowed EPROMs were replaced with EEPROMs instead, the electrically erasable ones. No more putting batches of them in the UV eraser. I programmed quite a few of those by hand in the lab. And adiabatic expansion of gases, while generally having a cooling effect... https://lecdem.physics.umd.edu/i/i5/i5-15.html that isn't always the case. I was going to use hydrogen as an example, but hydrogen apparently has multiple things working against it. Who knew... Keep these in mind, when you see the new hydrogen-powered cars in the showroom. https://www.eng-tips.com/viewthread.cfm?qid=51712 Paul I used a lot of Freeze-T to test for thermal resistors in TV sets which caused vertical roll and horizontal tearing in TV sets. Never used it on eproms, But way back then I built an eprom burner to burn monitor roms and small programs for the Apple II and Apple GS computers on 2716 and 2732 roms, For the 25 volt DC required I used three 9 volt batteries in series. For erasing I had an enclosed U shaped UV lamp in an aluminum enclosure with a sliding lid. Rene |
#33
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Tip: blowing out fans
On Wed, 13 Nov 2019 15:17:23 -0500, Paul
wrote: default wrote: On Tue, 12 Nov 2019 14:55:44 -0800, T wrote: On 11/12/19 5:55 AM, Jonathan N. Little wrote: T wrote: That would definitely be part of the design. It is okay to spin the fan a little, just don't exceed by much what it is designed to spin at. Some Air Compressors can make that fan spin so faat, the computer is about to take off! And yes, it is fun. Resist the urge! I finally found 60, 92 and 120 mm PWM fans I like. A simple solution when blasting to remove stubborn crud on blades is a finger on the fan BEFORE blasting away. With canned air, that can get pretty cold! I put my plastic ball point pen in them. The stuff is cold because they use refrigerants. In fact there's several DIY Utoobe vids of shade tree mechanics using "Dust Off" products to recharge auto AC units because it can cost less. (and they sell a side-piercing aerosol can tap for the purpose) The danger to a computer might be from the cold - particularly if it condesnses water from the air, causes thermal stress on connections, or is powered up at temperatures it was not designed for. And it is so, so much fun to see the blades whirl. Damn that self control thing! Well, there is that. Entertainment value. The only part in a computer with a significant exposure from "freeze mist", is a "DIP EPROM with window". We killed a few of those, while doing thermal testing on the bench. I don't remember other parts having a problem with that sort of testing. The material in the cans, was a freon-like product, and the surface temperature achieved was around -55C or so. If you thought a particular hardware interface had marginal timing, you could use freeze mist to check. It's human nature, to get carried away with that stuff. It eventually disappeared from the market, that particular product (Chemtronics, white spray can). And windowed EPROMs were replaced with EEPROMs instead, the electrically erasable ones. No more putting batches of them in the UV eraser. I programmed quite a few of those by hand in the lab. And adiabatic expansion of gases, while generally having a cooling effect... https://lecdem.physics.umd.edu/i/i5/i5-15.html that isn't always the case. I was going to use hydrogen as an example, but hydrogen apparently has multiple things working against it. Who knew... Keep these in mind, when you see the new hydrogen-powered cars in the showroom. https://www.eng-tips.com/viewthread.cfm?qid=51712 Paul I always hold the can under a hot-water tap. Works for spray paint too. You get a real blast! |
#34
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Tip: blowing out fans
On 11/14/19 6:21 PM, Peter Jason wrote:
On Wed, 13 Nov 2019 15:17:23 -0500, Paul wrote: default wrote: On Tue, 12 Nov 2019 14:55:44 -0800, T wrote: On 11/12/19 5:55 AM, Jonathan N. Little wrote: T wrote: That would definitely be part of the design. It is okay to spin the fan a little, just don't exceed by much what it is designed to spin at. Some Air Compressors can make that fan spin so faat, the computer is about to take off! And yes, it is fun. Resist the urge! I finally found 60, 92 and 120 mm PWM fans I like. A simple solution when blasting to remove stubborn crud on blades is a finger on the fan BEFORE blasting away. With canned air, that can get pretty cold! I put my plastic ball point pen in them. The stuff is cold because they use refrigerants. In fact there's several DIY Utoobe vids of shade tree mechanics using "Dust Off" products to recharge auto AC units because it can cost less. (and they sell a side-piercing aerosol can tap for the purpose) The danger to a computer might be from the cold - particularly if it condesnses water from the air, causes thermal stress on connections, or is powered up at temperatures it was not designed for. And it is so, so much fun to see the blades whirl. Damn that self control thing! Well, there is that. Entertainment value. The only part in a computer with a significant exposure from "freeze mist", is a "DIP EPROM with window". We killed a few of those, while doing thermal testing on the bench. I don't remember other parts having a problem with that sort of testing. The material in the cans, was a freon-like product, and the surface temperature achieved was around -55C or so. If you thought a particular hardware interface had marginal timing, you could use freeze mist to check. It's human nature, to get carried away with that stuff. It eventually disappeared from the market, that particular product (Chemtronics, white spray can). And windowed EPROMs were replaced with EEPROMs instead, the electrically erasable ones. No more putting batches of them in the UV eraser. I programmed quite a few of those by hand in the lab. And adiabatic expansion of gases, while generally having a cooling effect... https://lecdem.physics.umd.edu/i/i5/i5-15.html that isn't always the case. I was going to use hydrogen as an example, but hydrogen apparently has multiple things working against it. Who knew... Keep these in mind, when you see the new hydrogen-powered cars in the showroom. https://www.eng-tips.com/viewthread.cfm?qid=51712 Paul I always hold the can under a hot-water tap. Works for spray paint too. You get a real blast! For the spray paint cans, I used to just "soak" them in a pan of hot water, shaking the can occasionally, until the contents were warmed all the way though. Really gave me a great looking result. -- Ken MacOS 10.14.6 Firefox 69.0.2 Thunderbird 60.9 "My brain is like lightning, a quick flash and it's gone!" |
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