Electronics and technology blog    /    All publication of the user kirich    /    Page 29

The last battery from my test order at nkon, and I saved it for "dessert" because it’s not only a high-current battery, but also comes in the relatively new 21700 form factor, with a capacity of 4000 mAh. What’s more, today I’ll be testing it at currents above 30 A.

Well, friends, judging by the claimed capacity, these could be considered record-breakers in the 18650 form factor. I mean, 3600 mAh—is that really what they deliver? A review, tests, and conclusions, as usual.

Looking for an alternative to the well-known Panasonic 18650B and Samsung 35E, I decided to see how LG, another well-known manufacturer, was doing with high-capacity batteries. So I ordered two types, and today I’ll be talking about the first one.

So, I’m done reviewing batteries I already knew pretty well, and I’m moving on to models I’ve never tested before. I’ll start with the relatively new VTC5D series batteries. I hope this will be useful.

I won't go into a long account of the purchase this time—just a brief review of a couple of popular VTC6 cells. As a bonus, I'll compare them with cells sent to me earlier by one of my readers and bought from the same store, nkon.

I've already reviewed quite a few batteries from nkon, but those were sent to me by one of my readers. Now I've finally got around to buying from the store myself, and as it turns out, it's not difficult at all. But it's best to read all about it in the review.

A friend once brought me a couple of batteries to test. He bought them from us, but as far as I know, they came from AliExpress, either from the Liitokala store or Charger Battery Store. In any case, they’re essentially the same batteries, so I thought, why not test them? It might come in handy for someone.

Recently, I wrote that I’d bought a selection of different electronic components at our local shop. Among them were electrolytic capacitors of various types, which I needed for a small modification to one of my converters. Today I’ll tell you how simply replacing a capacitor can significantly change a converter’s—or power supply’s—performance.

Someone sent me information about a Banggood sale, so I decided to share it with readers.

I’ve already reviewed a couple of laser distance meters, and now a friend wanted a simple model too. He ordered one for himself so he could try it out and, while he was at it, tell me about it and put together a short review.

It turns out that even the widespread arrival of switching power supplies in our lives—which I’ve told you about in many reviews—hasn’t managed to completely replace conventional transformers. They’re used where a switching power supply isn’t suitable because of its “quirks,” especially in linear power supplies, audio equipment, and many applications where interference is undesirable. Today, I’m going to talk about these transformers.

I got my hands on two more converters from the well-known Chinese company YZXstudio. One is simpler and cheaper, while the other is correspondingly more expensive and comes in a “top-of-the-line” configuration. The second one isn’t just a DC-DC converter, but a universal bidirectional converter. But I think it’s best to read all about them in the review.

Today I'm reviewing a kit for building a useful device of your own: a speaker protection circuit. I'll explain what it is, why you need one, and how to assemble it. And of course, there'll be a few tests.

I was asked to post information about this promotion, and I thought it might actually be useful—maybe you'll find something worthwhile.

Not long ago, a friend asked me to do something like an inspection of four 18650 batteries he’d bought at our local market. They were being sold as genuine, but he had his doubts and decided to check. So I decided to put together a short article based on this, with some real-world examples.

As luck would have it—or, more precisely, thanks to my regular reader Alex—I got my hands on another battery made by Samsung. It may not boast a high capacity, but it’s still very interesting, primarily because it’s designed for high-power applications such as e-cigarettes and power tools.

Several times, people in the comments suggested I branch out from my usual review topics—power systems, computers, and TV boxes. That was part of the reason I agreed to review a product that’s way outside my usual territory: an RC car. The other reason? Well, how could a 45-year-old boy resist the temptation to race an RC car around the floor? :) Warning: heavy traffic!

I was offered the chance to try out an audio cable—not taste it, of course, but try it out in the general sense. I thought, why not? A cable is a useful thing and is sure to come in handy around the house. So today I’m reviewing two cables: a regular one with wires and an optical one.