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Bidirectional and unidirectional testing Checking the optical line at both ends with two reflectometers Bidirectional testing using one OTDR

A cost-effective, compact amp using the NE5532 op-amp, providing clean, high-quality audio for headphones and as a buffer with gain in audio systems. It avoids the complexity of tube and transistor amps.

The difference between passive and active splitters, their use cases, and the benefits of integrated 'loop-out' functions for local monitoring in various settings, such as gaming, video production, and lecture halls.

Many of us program microcontrollers and know that counters and timers are important parts of them. But not everyone remembers that they are also produced in the form of separate ICs, and once upon a time counters were assembled using flip-flops and logic elements.

RSP-150-24 is a 150W single output enclosed type AC/DC power supply. This series operates for 85~264VAC input voltage and offers the models with the DC output mostly demanded from the industry.

Price-to-performance ratio. What accessories and equipment are necessary? The main criteria for choosing an optical reflectometer.

Welcome to my guitar effects workshop! This scheme is already 46 years old. If you want tons of vintage mojo, you should consider assembling of this guitar pedal.

Between resolution and color, the latter is more about perception. Yet it can be described as a mix of color space picked, the importance of back lighting, and the effects of subsampling.

Let's assemble a completely analog PWM LED brightness controller using four operational amplifiers and figure out why PWM is needed and what it is.

We teardown and tested in different modes LRS-75-24 power supply from Mean Well. It's a 75W single-output enclosed power supply with a low-profile 1 1/5" design. The device has extremely low no-load power consumption (less than 0.3W).

Intermittent defect: wait or fix? Why is it specifically a reflectometer? Pupin coils are now obstacles to digital services.

What do you do when the controller doesn't have many pins to connect buttons, indicators, relays, etc.?

HDMI is the go-to standard for video output (and, subsequently, input). Partly thanks to its simple, backward-compatible standardized plug. But still, there are a bunch of different cables out there and an odd-looking tiny HDMI port on some devices, so what's the deal here?

A seemingly simple thing - an LED amplifier. The user chooses a device of suitable output power and uses it. But the devil lies in the details. From this post, you will know how LED strip amplifiers differ, what is not written in the documentation, where and in what lies, and what problems these devices can create. And also any buyer wants to understand why these simple devices have a large price range.

How cable branches are formed? What's wrong if a branch is? Methodology for locating the branch connection point

This simple and inexpensive unit will help test various devices; with it, one can determine the power factor of the AC grid draw, power-on and power-off times, etc.

When it comes to clean guitar tone, we all think of Fender amps. And the overdriven sound is, of course, Marshall. Can a small transistor pedal replace a real tube amp? - Let's try and listen!

HDMI is the most common interface for video signals. But what is HDMI, and why is it so popular? And what should we know about it?

The poor quality of light (flashing) in Shelly bulbs and LED controllers damages your eyes. However, the cause of light flickering (PWM frequency) can be fixed with your hands in 10 minutes. How can we improve the light performance?

Signs of water presence in the cable Methods for locating cable water ingress points What if there's a fault in the waterlogged section of the cable?