A short time ago, I was working on a small digital project hat required the use of circuit-status indication lights outside of the building that the device was installed in. LEDs, of course, were the appropriate choice for these indicators and, because of obvious weather conditions, etc., I had to use some sort of “weather-proof” enclosure for the LEDs. On my workbench was a package of those very common pencil-topper erasers that are simply inserted over the end of a pencil....
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