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At the end of last year, I wrote about a 2,400 W electronic load. At the time, it was essentially a pilot unit ordered by one of my customers. After the New Year, I ordered several enclosures designed specifically for this version and decided to take it beyond the prototype stage—even if not into full production, at least to the next level.

Sometimes it feels like voltage converters are everywhere, even in places where you wouldn't expect to find them. You can find them in power banks, smartphones, TV boxes, computers, USB hubs, routers, and many other devices. But converters are also sold as standalone modules, intended for everything from hobbyist projects to professional use. And today, we're going to talk about these "invisible helpers".

This story began a long time ago—I think more than a year ago, though its roots actually go back to 2023. Today, I’ll show you what it all led me to.

It all started when I ordered a couple of CL24 loads a while back. They sat around for a while, and I thought, why not build a couple of complete devices around them? So I thought about it, thought about it some more, and did it.

Not long ago, I posted a couple of reviews—one of a voltage converter and one of a power supply—and mentioned that I’d bought them specifically for a new version of one of my projects: a battery tester. Today, I’ll tell you a little about it.

Not long ago, I showed a new version of an electronic load. In a sense, it’s a downgrade—a step backward rather than forward—but it’s not that simple, so I decided to put together a short article.

Yes, today this isn’t a review or an article, but a story. It’s about the TEC-80K electronic load, which is fairly popular and well known, and about my new device based on this controller.

Today, this isn't a review so much as a look back at my experience searching for, choosing and buying a tablet from one of our online stores, along with a few recommendations based on what I learned along the way. The tablet in question is the Microsoft Surface Pro 9.

Today, the Verkhovna Rada of Ukraine passed two bills, No. 11258 and No. 11259, in their second reading and as a whole. They are intended to restore the energy infrastructure and clear mines from Ukrainian territory as quickly as possible.

I've already explained how to turn an ordinary power supply into a charger, but for a long time I couldn't shake the thought that a charger should work more properly. Then I came up with the idea of making one that was not only proper and simple, but also based on the adapter board I'd already shown.

I haven’t been posting much lately, and someone even asked if everything was okay with me. Unfortunately, I’ve had a lot on my plate, and I’d like to tell you about some of it today, since it turned out to be relevant to buyers and interesting to me.

Not long ago, I featured a new power module in several of my videos. You may also have seen the backstory behind it in a few other reviews. I can now say that the project has reached a kind of logical conclusion. Though, to me, a conclusion is really an opportunity to improve on what came before and start something new, perhaps even more interesting.

In today’s world, there are many electronic devices, and progress is driving them toward ever-smaller sizes. Repairing them with a “grandpa’s” soldering iron is becoming increasingly difficult, though there are still areas where one can come in handy. But today we’re not talking about soldering irons. We’re looking at much more sophisticated equipment, intended not so much for home use as for professional applications.

I’m often asked about batteries, building battery packs, and where to buy cells without ending up with junk. Today I have a short article and video on the subject.

About a month and a half ago, I reviewed an inexpensive power bank case that was convenient, affordable, capable of delivering up to 22 W, and supported fast-charging protocols. But ever since then, I’ve wanted not only to fit it with the highest-capacity batteries possible, but also to make a few improvements.

With the widespread use of various mobile devices—and, consequently, power supplies and power banks—that use a standard USB connector, an entire class of electronic loads designed to test them has emerged. In fact, these loads have a lot in common with regular electronic loads, but their specific applications mean they may have features that regular loads lack. At the same time, they may not be able to do everything their “big brothers” can.

I’m often asked about various things, and questions about changing a power supply’s output voltage are probably among the most common. Today I’d like to explain the subject a little; hopefully it will help someone.

I can’t even remember when or how this little board came into my possession, but it was clearly a long time ago. It sat around for years until I happened to come across it and decided, just out of curiosity, to figure it out and repair it. Read on to see how that went.