When it comes time to buying a CPU for your desktop, you’ll find a dizzying collection of model numbers and specs from both Intel and AMD. Tom’s Hardware has listed the best CPUs for gaming and best processors for work. If you want to know how each chip stacks up against all the others, this →
Christmas lights can be a beautiful sight to behold. They can decorate public spaces and homes. Stringing lights outside can be a real safety hazard if you’re not careful. For outdoors use the lights you need to have lights that are designed to be used outdoors. For outside use there are nowadays both consumer and →
Here is maybe simplest power over Ethernet (PoE) powered LED Christmas light. This circuit provides powering of LED light string from IEEE 803.2af compatible standard power supply. On the up there is the IEEE 802.3af PoE power supply that feeds 48V DC power to RJ-45 connector when it detects a PoE needing device connected. I →
An ideal power inverter will produce same kind of power that is available from mains outlet, which typically means sine waveform 60 Hz 11-120V AC or 50 Hz 220-240V AC. That kind of power source can power all mains powered devices as long as enough power is available. Where power inverter devices substitute for standard →
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 →