This is a continuation to my Power inverter designs post. The first post was about general details of inverters and square wave inverters. Because square wave inverters are not suitable for many applications. The next better inverter category is so called modified sine wave inverter. Modified sine wave inverters are less complicated than sine wave →
On Tuesday, Red Hat CTO Chris Wright and CentOS Community Manager Rich Bowen each announced a massive change in the future and function of CentOS Linux. Moving forward, there will be no CentOS Linux—instead, there will (only) be CentOS Stream. CentOS Linux is dead—and Red Hat says Stream is “not a replacement”. CentOS Stream, founded →
Electronics component shop are dying. My nearest electronics component shop Yleiselektroniikka in Espoo Finland at Luomannotko 6 just closed it’s shop few weeks ago. They still sells online. The remaining shops are much smaller and much farther away on other nearby cities (Helsinki and Espoo). The way seems to be now to return to mail →
Buying a 5G protection shield seems to be a zero sum game where you always loose: If you get product that works as advertised you will loose your connectivity and if you buy a non-working you loose your money to a scammer. Conspiracy Theorists Buy Faraday Cages To “Protect” Themselves Then Complain When They Work →
A huge radio telescope in Puerto Rico has collapsed after decades of astronomical discoveries. The Arecibo Observatory in Puerto Rico was one of the largest radio telescopes in the world. It features prominently in the last part of the 1995 movie GoldenEye. At that that time the crash was fiction, but fiction became in some →
Found some broken LED christmas lights (operated originally from 24V transformer) and a suitable spare switch mode power supply (36-72V to 24V). Then I got an idea to combine them to an experimental PoE Christmas light project. Circuit diagram: The circuit operation: Initially circuit presents around 23 kohms impedance when low voltage is on line →
This posting is here to collect cyber security news December 2020. I post links to security vulnerability news with short descriptions to comments section of this article. If you are interested in cyber security trends, read my Cyber security trends 2020 posting. You are also free to post related links to comments. →
A power inverter, or inverter, is a power electronic device or circuitry that changes direct current (DC) to alternating current (AC). The inverter does not produce any power; the power is provided by the DC source. This document is collection of information on power inverter technology and gives links to DIY circuits – both good →
PAR CAN stage light is a truly versatile lamp. It can be used to make snacks or keep pizza warm. Ha, modern kids and their LED lamps can’t do this! Safety first: recognize the fact that Big Clive has a par can fitted with a dubious container full of flammable oil, cooking popcorn…but took the →
Radiation is the emission or sending out of energy from any source. Generating, transmitting, distributing, and using electricity all expose people to ELF radiation. Power lines, household wiring, and any device that uses electricity can generate ELF radiation. How much electromagnetic radiation you are exposed to depends on the strength of the electromagnetic field, your →