Here is one experiment to power two LEDs using Qi standard smart phone charger. The two LEDs are wired to opposite directions in parallel to the output wires of 0.17 mH coil. The coil has around 80 turns (5 layers and about 16 turns each) Here is LED active I actually built two circuits with →
Here is one experiment to power two LEDs using Oral B toothbrush charger. The two LEDs are wired to opposite directions in parallel to the output wires of 0.17 mH coil. This circuit can be used as an interesting novelty circuit drive a LED wirelessly from a toothbrush charger. In addition to that the circuit →
Wireless charging for toothbrushes offers a convenient and cable-free solution. Wireless charging eliminates the need for physical connectors or USB cables. Toothbrushes are commonly used in wet environments (bathrooms), and wireless charging systems for toothbrushes can be designed to be water-resistant. It’s a well-known fact that electronics and water do not go together. Most electric →
This posting is here to collect cyber security news in February 2024. I post links to security vulnerability news to comments of this article. You are also free to post related links to comments. →
Have you ever wondered about how safe your place or position is regarding electromagnetic and magnetic fields? An EMF meter is a scientific instrument for measuring electromagnetic fields (abbreviated as EMF).EMF meters measure fluctuations in electromagnet fields. Measurements of the EMF are obtained using an E-field (electrical field) sensor or H-field sensor (magnetic field). I →
There are two widely used mains power frequencies for alternating current: 50 Hz and 60 Hz. Unless specified by the manufacturer to operate on both 50 and 60 Hz, appliances may not operate efficiently or even safely if used on anything other than the intended frequency. But there are also other frequencies used for power. But →
40 years since Sinclair QL was released. And what a weird machine it was. I did not own one, but a friend had one. How Sinclair’s QL computer outshined Apple’s Macintosh against all odds https://www.theregister.com/2024/01/16/ql_legacy_at_40/?fbclid=IwAR25KCqGpu82VR-PVy_z_TMatwxHLKu58XMT0fw7VnQ8Zgqas_IaBqOkXMA Compatible hardware and peripherals are still on sale, four decades after its launch. Two weeks before Apple launched the Macintosh, →
Here is an overview of Spectre and Meltdown vulnerabilities that got a lot of publicity in January 2018. Meltdown and Spectre the two original transient execution CPU vulnerabilities. The Meltdown and Spectre vulnerabilities were considered “catastrophic” by security analysts. The vulnerabilities are so severe that security researchers initially believed the reports to be false. In →
Who remembers Phone booths and above all phone cards? Phone cards were a technological advance in the world of public telephone traffic in the 1990s. They allowed to make calls on many phone booths in Finland and phone cards were also a popular collector’s item, collected both used and unused: Telecom companies have placed advertising →
Transistor–transistor logic (TTL) is 60 years old this year based on the following article (Wikipedia claims this happened already in 2023). TTL became the foundation of computers and other digital electronics. TTL integrated circuits (ICs) were widely used in applications such as computers, industrial controls, test equipment and instrumentation, consumer electronics, and synthesizers. The 7400 →