Archive for June 2021

Ethernet over voltage protector

I got 10BASE-T and 100BASE-TX Ethernet running through this over voltage protector. They are nor designed for faster data rate. Those protectors are designed to protect two 100 ohms wire pairs. They are designed to work well up to 60 MHz signal and have low capacitance (around 30 pF between wire pair wires). Links to

Windows 11 is released

Microsoft announces Windows 11, generally available by the holidays Microsoft today officially announced Windows 11, the next version of its desktop operating system. Microsoft plans to release Windows 11 to the general public by the holidays, so we can probably expect it sometime around late November. You will now also be able to run

Telephone connector adapters

Here is a collectio of adapters for different phone line connectors around the world. Those telephone connector adapters are designed to connect RJ11/12 plug cable to wall phone outlet on different countries. Different countries use or used to use different type telephone connectors on wall outlets. Those adapters were are used convert one country specific

BC547 and 2N3904 transistors

They are Bipolar Junction Transistor. Both are NPN Transistors. Their difference is manufacturer and hFE and datasheet parameters, seriously. BC547 is European transistor while 2N3904 is American transistor. Both are common NPN bipolar junction transistors used for general-purpose low-power amplifying or switching applications. The BC548 was released with, and often is found together in

PA amplifier rack

Building a sound system is often a highly personal process, from deciding what to get, to assembling and using it. Here is my PA system I built in 1990′s and used for some mobile DJing. The need for measurements were that it should fit easily to a normal size car with everything else that is

DDR5 memory is coming

In the hardware world, we’ve gone through generations of GPUs and processors, but we’re still rocking the same DDR4 RAM that’s been mainstream in PCs for almost seven years. But now it seems that DDR5 is finally coming: DDR5 modules are just around the corner, as production is in full swing and manufacturers are teasing

Antenna isolator teardown

A ground loop in your AV system caused by antenna connection or TV cable is very common if you have your computer connected to the same system. This type of ground loop problem can be solved by using suitable isolator between your AV system and the antenna cable. Antenna isolator is very convient way to