We will study how the pairs in one multi-pair cable and different cables close together affect each other. We will learn the basic characteristics of this influence - the fundamental parameters NEXT and FEXT.

Many guitarists consider the DS-1 to be the worst-sounding guitar pedal. Could this 1978 Roland design be a failure and is now hopelessly outdated? We can get a good sound out of this classic pedal, too. For that, we'll put it, listen to it, and start by studying the circuitry.

What's the difference between a regular twisted-pair HDMI extender and an over-IP. HDMI over-IP extender image compression and video transmission delay. Lenkeng LKV383PRO vs Lenkeng LKV373.

‍Carrier signal feed relative to the ground. How to choose the right grounding point for the transmitter? Tracing pipelines and cable channels made of conductive and non-conductive materials. Identification of pairs in multipair cables.

A teardown / review of a well-known power supply with wireless control. Manufacturing quality, circuitry, output voltage quality, waveforms.

How is the generator connected? How to choose the right type of receiver probe? How to provide a probing current in the line being traced? What affects the range of the locator?

DIY voltage-boosting LED driver How is it assembled? How do you convert an existing one to suit your needs?

Twisted-pair extenders can be split into two types: 1. only work over "straight" twisted pair 2. work as a "straight" twisted pair, so in a LAN network

How does one determine the current direction and strength of the probing signal? Which techniques allow the most accurate determination of the cable's depth? How does one consider the influence that induced signals have on neighboring cables?

Do you want dynamic LED turn signals for your bicycle? Do you also want a dynamic brake light? (in part two) Or maybe you want an emergency signal? (in part two) And all that WITHOUT a microcontroller? (only logic circuits)

What is the purpose of this type of device? There are cases when it is necessary to multiply the signal from one video source (TV-tuner, PC, video recorder) to several displays.

What makes up a cable locator receiver? Which sensors are used in receivers? What is the purpose of the different types of sensors and various combinations of sensors used? How does one correctly orient the receiver to the cable being traced?

How quickly does the illumination reduce when the supply voltage decreases? How does the illumination decrease due to voltage loss in a long LED strip?

Are you planning to hide this device on a table behind an NVR, TV, monitor, etc.? Or will the transmitter and receiver be placed in plain sight, e.g. on a wall, under a tabletop, or on a surface in some other way?

How does a generator's signal frequency affect the range of the cable location signal? What cable identification frequency is more efficiently? Why can cable identification at low frequency be more reliable? And when is passive location used?

What happens if the installer chooses the wrong connector for the LED strip or lights? What happens when a connector passes a high current? What is more dangerous - a thin wire or a low-quality connector?

There aren't many consumers who pay much attention to design when choosing an HDMI extender over a twisted pair network cable. But it can be quite important in some cases. What if you choose a compact type of extender?

This post contains a brief introduction to cable location principles. What does a typical locator consist of? Active/passive location methods. Cable connection methods.

How does the power consumption affect the LED chip heating? Can I mount the LED strip on the chipboard directly without the aluminum profile? Is COB technology really more efficient at dissipating heat from LED chips than traditional SMD technology?

Buyers of HDMI extenders often ignore an additional feature: the HDMI pass-through output of the transmitter. I will look at what it is, where it can be useful, and whether it is worth overpaying for it.