Not only stanochnika produc on, but a lot of homebrew it is recommended to wear protective eyewear when obrabotki materials or eatock tools. Therefore, they should always be with yourself is at hand. Usually where? Of course in a breast pocket. But the man bent glasses slip and… But rather on one of the temples points to attach the clip such as those used on some pens or pencils, and the reliability of their fixation in the pocket is guaranteed.
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UNIVERSAL INDICATOR
Two LEDs with different color (e.g., red and green), you can build a simple indicator for voltages from 4.5 to 220 V. It is also able to determine the polarity of the source in the range...
“LIVING” WATER AND “DEAD”
"I know, I know— says a reader, after reading the title.— Yes, but neither "alive" nor "dead" water does not happen. Tales!.." Is he right? A few years ago, the magazine "Inventor and...
