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This is my second pair of batteries from Vapcell, and unfortunately, it looks like it will be the last for now. These batteries don't stand out for their capacity, but they do deliver an impressive 35A. Inspection, tests, graphs, comparisons, and conclusions—as usual.

A while ago, I came across a review of a clock that synchronizes via NTP. Since I’m generally fond of clocks, I couldn’t resist and ordered one for myself. I actually ordered it from a different store, where it was a little cheaper, but that doesn’t really matter here, since they’re identical.

It's been quite a while since I last reviewed any batteries, so Vapcell sent me a few new test subjects. Today, we're looking at the first pair. I can't really say anything bad or good about them. They're perfectly decent batteries, but nothing particularly special.

I've already written a couple of posts about spot welder controllers that work with supercapacitors, but today I'm going to talk about a more "classic" setup with a powerful 50 Hz transformer. I'll show you the controller itself and a small example of how it's used in a real spot welder.

As 2021 draws to a close, and following tradition, I decided to publish my annual roundup of battery reviews. This time there are fewer than I expected, but I hope it will still be useful.

I’ve already posted an announcement for this converter model, which is an evolution of the previous 6006P model, differing mainly in its lower output current and power. Several readers have already asked me about this model. Well, it arrived, I took a look, tested it, and formed an opinion.

Another roundup of assorted products. Some were bought recently, while others caught my eye while browsing AliExpress. They might come in handy.

I’d wanted to buy a signal generator for a long time, but kept putting it off. Maybe because I already had a couple of basic models at home, or maybe because I didn’t really need one that badly. But after watching one of the videos, I finally decided to get one. I found the lowest-priced option available at the time, placed the order, received it, and did a few tests. I also upgraded the firmware to the higher-end model’s version.

It’s been just under a year since RuiDeng announced the previous version of its hybrid power supply, and now the developers have finally released a new model I’ve been waiting for: the same kind of hybrid converter, but with an output current of up to 12 A. Today’s “not a review” will include a brief announcement, a description, the differences, real photos of the device, and, I hope, a discussion of the new model in the comments.

By a twist of fate, another power supply landed in my hands for a while—or, more precisely, one of the variants of a model I’ve reviewed before. As it happened, though, I had to make a few modifications before testing it. As always, the details are in the review.

I’ve already reviewed a similar router, but that one was corded. Lately, though, I’ve found cordless tools more and more convenient, so I decided to give this version a try. For the most part, the two tools are very similar, so as I go along I’ll describe the cordless version and share my impressions of using its corded sibling, based on hands-on experience.

A roundup of popular AliExpress products. I haven't bought these myself, but picked out products that other people buy very often, so there's a chance they're not all as bad as they sometimes turn out to be :)

I was just looking for a signal generator and decided on the UNI-T UTG932E. Since I came across a pretty good price, I thought someone else might find it useful too.

Some time ago, we got to talking about manufacturers of protection devices, and I said that I consider products from three companies to be high quality: Novatek-Electro, Meandr, and Zubr. Meandr products aren't readily available to me, and I've shown Novatek products several times, so now it's the turn of another Ukrainian manufacturer, DS Electronics, which makes products under the ZUBR trademark.

I’ve reviewed a similar converter before—or at least one that looked very much like it. But in this case, the store says it’s the Second generation, i.e. attempt number two :) So why not take a look and see what it’s all about.

Today I'm reviewing a voltage relay from the fairly well-known Volt Control series, specifically the VC-115 model. Inspection, teardown, tests, conclusions—as usual.

It's been a while since I posted a roundup, and there's another sale on AliExpress. Anyway, I didn't spend long looking around; I just decided to share links to products I've ordered recently, in case they might be useful to someone else too. These are all products I actually ordered, and I've already received some of them, so the sellers have been tested.

Not long ago, I posted some information about the relatively new DL24M electronic load, a follow-up to the DL24, which I reviewed about a year ago. When I posted about the DL24M, AliExpress was having a sale, so I bought one for myself, and today I want to tell you about it.