Archive for October 2021

Coiled mains cable heating and inductance

What is the problem of using a coiled extension cord? When the power cable passes a considerable load current, it will definitely heat up noticeably. As the load current increases, the temperature of the cable surface will be higher. A cable loaded near it’s rated current can feel that it is warm to the touch,

20 years of Windows XP

Obsoleted Windows XP has become old. It’s Windows XP’s 20th birthday and way too many still use it ​”Today is the 20th anniversary of Windows XP, and although the operating system reached the end of support in 2014, way too many people continue to use the insecure version of Windows.” “Windows XP was released

Data center videos

A data center (American English) or data centre (British English) is a building, a dedicated space within a building, or a group of buildings used to house computer systems and associated components, such as telecommunications and storage systems. A data center’s design is based on a network of computing and storage resources that enable the

Friday Fun: Back at office for meetings

When you’re meeting are back in the office, things are somewhat different than in remote working… Back to the Office: When Meetings are No Longer Virtual | Foil Arms and Hog The Expert: Progress Meeting (Short Comedy Sketch) The Expert (Short Comedy Sketch) More: The Expert: Wrong Angle (Short Comedy Sketch) The Expert: IT Support

Origin of Schuko®

“Schuko” is a short form of the German term Schutzkontakt (literally: protective contact),[1] which indicates that plug and socket are equipped with protective-earth contacts (in the form of clips). It is very commonly used throughout Europe for 230V 50 Hz AC power up to 16A. Origin of Schuko®

Contactless credit card secrets

Let’s take look at a modern credit card and the nifty electronics it contains. Modern credit cards contains a micro-controller that is connected to the credit card chip contacts and on cards with wireless payment also to an antenna coil inside the card. On the surface the chip inside a card is a typical micro

OWASP updates top 10

OWASP updates top 10 vulnerability ranking for first time since 2017 “Nonprofit foundation Open Web Application Security Project (OWASP) has released an updated draft of its ranking of the top 10 vulnerabilities, the first changes to the list since November 2017.” The list is available on-line at Maybe the most significant change in

Professional cable tracer details

I saw this cable tracer equipment in use few days ago connected to a telephone cable. Here is the device connected to the cable. Closer view of the device reveals code CTT45 type code and manufacturer name VESALA. It is a product made by a Finnish company VESALA. The CTT45 is the transmitter part of