Biltema sold this ground fault interrupter (RCD / GFCI) device few years ago (does not seem to sell anymore). It is designed to be connected to 230V AC 50 Hz electrical outlet. The information on the back of the device tells that this will trip at 30 mA leakage current. The symbol tells that this →
I got a CEM SMD-100 Smart Electronic Components Tester because it was on sale at very low price. It turned out to be a bad investment. The component tweezers part make very intermittent contact with the meter, so measuring the components was very unreliable. The meter seemed to work OK with the measurement supplied leads →
http://www.worldwatch.org/node/4803 For the first time, scientists have produced a photovoltaic (PV) cell with a conversion efficiency of 40.7 percent, the U.S. Department of Energy (DOE) reported. The breakthrough cell was developed using a structure called a “multi-junction solar cell.” The technology may allow for lower PV system installation costs ($3 per watt) and lower electricity →
This posting is here to collect security alert news in July 2018. I post links to security vulnerability news to comments of this article. →
https://spectrum.ieee.org/semiconductors/devices/july-1958-kilby-conceives-the-integrated-circuit In 1958, 11 years after Bell Labs reinvented the transistor, it became clear that semiconductors would be able to conquer the electronics market only if they could be greatly miniaturized. In July1958, Jack S. Kilby of Texas Instruments came up with the monolithic idea. In January 1959, Robert Noyce was to jot in his →