All about electronics and circuit design

PoE Powered Christmas Lights

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

Cyber security news December 2020

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.

Power inverter designs

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

Friday Fun: Popcorn lamp

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

Under the 110 kV power line

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

50 ohm vs 75 ohm conversion

Coaxial cables are measured by impedance. The most common impedance values are 50 ohms and 75 ohms. different cables. 50 ohms is most often used for radio transmitting and receiving applications. 75 Ohm is primary used for video and audio. 75 Ohm cables are the standard coax cable you find everywhere inside your home and

Uusiteknologia 2/2020 magazine published

Uusiteknologia.fi is a Finnish language electronics and technology professionals magazine published on-line. In the newest issue have written articles on many high tech topics (text in Finnish with short introduction in English). Newest issue Uusiteknologia 2/2020 has just been published. I have written two articles to the newest issue. The front page article is about

Calibration of multi-meters

I saw this question posted to ELECTRONICS HOBBY CIRCUITS IN FACEBOOK group: “can you tell me what is the meaning of calibration date of a multimeter and does it effect the work of a multimeter if it expires the calibration date?” The answer to this is: As all circuits will drift with time, the DMM