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By Bob Paddock at 06/23/07 09:28
A very common misconception is that Conformal Coating is a Hermetic Seal. It is used a lot in the Coal Mines, and the Electronic Industry in general, to keep the caustic dust off circuit boards.As Conformal Coating is not a hermetic seal, what real happens is the impurities in the water are kept away from the circuit, but the water itself reaches the traces. Since the water is now fairly devoid of contaminates the water acts more like a dielectric insulator. You never notice it in a low impedance digital circuit, but unless debugging is an obsession don't let it get near a RF tuning circuit or a high impedance Wireless Sensor Network circuit. Tags: conformal coating • hermetic seal • coal mine • wireless sensors networks wsn •
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By Bob Paddock at 06/23/07 09:07
Picture Kentucky Coal Miner on the phone to the maker of their Man-Hoist ("Coal Miner" for open air elevator, beats any Amusement Park ride, only next to the 'Man-Trips', the Roller-Coaster like ride that takes you into the Mine, where you may lose your head at any moment). Our Hoist only goes up. We've run out of cable, it is all on the spool. There ain't no more up! I'm sure you have experienced the frustration of needing just one more pin on your Micro. Here is why you don't let the Boss force you into take shortcuts to increase company profits: Seems the Hoist designers used two inputs one for Run/Stop and one for Up/Down. Up/Down faulted to 'Up', no mater what you wanted it to do, you only went up. They should have used four inputs, Run,Stop,Up,Down. The morale of this design tip: Don't take short cuts, people ultimately pay the price. Warrant Repairs are expensive when you have to travel to the mine. Tags: main hoist • coal miner • microprocessor design • amusement park ride •
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