- Microscopic Solder Job - 5 Updates
| Terry Schwartz <tschw10117@aol.com>: Jan 22 12:56PM -0800 At my last company, I spent the better part of my last 4 or 5 years dealing with water conductivity issues. We produced machines that electrolyzed water into base and acid components in order to produce cleaning chemicals. I visited customer sites all over the US and in several foreign countries in order to deal with water conductivity issues. Water conductivity is measured in micro-siemens. The lower the number, the less conductive the water. Distilled water was generally (not always) in the neighborhood of 1 to 10 micro-siemens and was our baseline for this work. Normal tap water could easily range from 50 - 70 micro-siemens to many hundreds of micro-siemens, or even greater. The highest (natural) conductivity we encountered was in a Home Depot warehouse in upstate New York, where the building was drawing it's water from a well, and the well was basically under a catch basin for road runoff. If I recall correctly, the level in that installation was on the order of 9000 micro-siemens. You could literally taste the salt. And on top of that, they had installed a bleach injection system in order to keep the fixtures from getting stained, and the water from stinking. Don't drink that water. I had designed the circuit board that electrolyzed the water, and had done so to accommodate a wide range of conductivity, but the challenge was always at the extremes. Too conductive, and the system would go over current and shut down. Not conductive enough, and we couldn't pass enough current thru it to cause electrolysis effectively. I developed solutions for both extremes, but at operational trade-offs of course. Interestingly, when we analyzed water samples, the source the conductivity was frequently different from site to site. And what we think of conventionally as "hardness" didn't always correlate to conductivity. |
| tabbypurr@gmail.com: Jan 22 01:21PM -0800 On Monday, 22 January 2018 20:56:52 UTC, Terry Schwartz wrote: > The highest (natural) conductivity we encountered was in a Home Depot warehouse in upstate New York, where the building was drawing it's water from a well, and the well was basically under a catch basin for road runoff. If I recall correctly, the level in that installation was on the order of 9000 micro-siemens. You could literally taste the salt. And on top of that, they had installed a bleach injection system in order to keep the fixtures from getting stained, and the water from stinking. Don't drink that water. > I had designed the circuit board that electrolyzed the water, and had done so to accommodate a wide range of conductivity, but the challenge was always at the extremes. Too conductive, and the system would go over current and shut down. Not conductive enough, and we couldn't pass enough current thru it to cause electrolysis effectively. I developed solutions for both extremes, but at operational trade-offs of course. > Interestingly, when we analyzed water samples, the source the conductivity was frequently different from site to site. And what we think of conventionally as "hardness" didn't always correlate to conductivity. I'd be interested to find out about the production of the cleaning chemicals. NT |
| Terry Schwartz <tschw10117@aol.com>: Jan 22 01:32PM -0800 > I'd be interested to find out about the production of the cleaning chemicals. > NT NT, feel free to google Orbio and Tennant ECH2O. Email me with questions if you'd like. Terry |
| Tim R <timothy42b@aol.com>: Jan 23 05:08AM -0800 On Saturday, January 20, 2018 at 9:32:21 PM UTC-5, rickman wrote: > Why is power relevant? We are talking about drying a phone. The battery > will be out, the SIM card will be out and of course the cover is off. What A large percentage of modern phones (and cameras, and similar devices) no longer have a removable battery. I know several people who have run a phone or a fitbit through the wash machine. None were able to save it. Is there any paper inside a phone, like there is in a computer or a keyboard? |
| "pfjw@aol.com" <pfjw@aol.com>: Jan 23 08:38AM -0800 On Tuesday, January 23, 2018 at 8:08:41 AM UTC-5, Tim R wrote: > A large percentage of modern phones (and cameras, and similar devices) no longer have a removable battery. As a vintage radio hobbyist that also dabbles in vintage audio, when it comes to some specimens, the Bosch dishwasher (made in Tennessee, USA) has become my best friend. Items that have been flooded, moused or otherwise damaged often respond very well to the process. As Bosch uses an indirect heating and drying system, there is no direct exposure to the heating element. So far, several tube TransOceanic radios, a few solid-state tuners and other electronics flooded at our summer house, and any number of vintage radio chassis have gone through with only good results. Paper items and speakers are removed, IF transformers are flushed and sealed prior to the start and if there are wax-covered coils the unit goes on the top rack. But, none of this stuff uses SMT technology with extremely dense multi-layer boards as are most cell-phones and other wearable technology. We are in a throw-away world, where the skills necessary to repair something like a FitBit exceed its value. Often by a considerable margin. I think that is what is most frustrating to the average user here. No amount of human skills or repair-bench tooling is going to equal what a robot can pack into a few square millimeters of board, much less be able to repair/replace individual components within that board. Peter Wieck Melrose Park, PA |
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