Electronics and technology blog    /    Materials for May 2019 year

My second power supply from SANMIM, this time a model from the low-profile series—that is, a “flat” 20 W unit with a 12 V output.

It's been a while since I reviewed a power supply, so I decided to make up for that by buying a few different compact units. As usual, this review will cover the inspection, tests, and conclusions.

A while ago, I reviewed a T2 receiver, and we also talked about how its functionality could be expanded a little by adding WiFi to the usual features. The problem was that receivers don't work with just any adapter, and my experiment with two "guinea pigs" confirmed that. During the discussion, someone told me which chip the adapter needed to use for the T2 receiver to "see" it. So I bought one and decided to put together a short review and report.

I got hold of a few compact step-down converters, bought just to “try them out”—they’re very cheap, after all. Today I’m reviewing a pair of almost identical, yet different, boards.

I came across a small voltmeter/ammeter board on Taobao and decided to order one and give it a try. Turns out I made the right call—but more on that in the review.

I've already reviewed voltage converter boards with QC support, but you always want more: more power and support for more standards. So I ordered several different models to try out. Rather than write three separate reviews, I decided to cover them all in one.

It’s already May, and I haven’t reviewed a single computer yet, so let’s fix that. Today we’ll look at a model that stands out from the crowd in its own way. Design is a matter of taste, of course—some people like one thing, others something else—but you have to admit this one is definitely original. As always, the review covers the exterior, teardown, tests, conclusions, and a final summary table.

My work often puts me in situations where a device connected to a computer via USB must not have a direct electrical connection to it. Otherwise, this can cause anything from severe interference to complete loss of functionality, as well as interaction between the computer’s power supply and the device under test. There aren’t many ways to solve this, and the simplest is to use galvanic isolation.

I’ve run into situations more than once where controlling devices directly from a computer over USB is easy to set up, quite reliable, and inexpensive, but still has its drawbacks. The main ones are that you’re tied to the computer and that simple adapters don’t provide galvanic isolation. This adapter was bought to solve all of these problems.

Here are a few coupons for TV boxes.

Sometimes you need to keep a small device, such as a router, powered without interruption. Using a regular "UPS" for this is both expensive and impractical, so low-voltage UPS units are used instead. Today I'll take a look at a couple of them.

Back in winter, news came out that RuiDeng was planning to release a new USB tester. I was particularly interested in this model, and now I have one in hand to test. This review covers the tests, as well as why this particular model caught my interest.