1,000 Watt Power Supply Tear Down And Repair

[TheSignalPath] wanted to repair a broken Instek PSW80-40.5 because it has a lot of output for a programmable power supply — 1,080 watts, to be exact. This isn’t a cheap supply — it looks like it costs about $2,200 new. The unit wasn’t working and when he took it apart, he found a nasty surprise. There is a base PCB and three identical power supply modules, and virtually no access without disconnecting the boards. He continued the teardown, and you can see the results in the video below.

Each of the power supply modules are two separate PCBs and the design has to account for the high currents required. The power supply is a switching design with some filtering on the motherboard. One of the boards of the power supply module rectifies the incoming line voltage to a high DC voltage (about 400 volts). The second board then does DC to DC conversion to the desired output.

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The Electronics of Cold War Nightmares

It is a good bet that if you look around you, you’ll be able to find at least one smoke detector in sight. If not, there’s probably one not too far away. Why not? Fires happen and you’d like to know about a fire even if you are sleeping or alert others if you are away. During the cold war, there were other things that people didn’t want to sleep through. [Msylvain59] tears down two examples: a Soviet GSP-11 nerve agent detector and a Polish RS-70 radiation alarm. You can see both videos, below.

In all fairness, the GSP-11 is clearly not meant for consumer use. It actually uses a test strip that changes colors and monitors the color change. Presumably, the people operating it were wearing breathing gear because the machine could take quite a while to provide a positive output. Inside reminded us of a film processing machine, which isn’t too far off.

The radiation monitor looks more like a miniature version of an old floor-standing radio. The case design, the thick-traced, single-sided, hand-drawn printed wiring board, and the –by today’s standards — huge parts within all contribute to making this look like a piece of radio gear from the 1970s or even earlier.

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Poké Ball Plus Teardown Reveals No Pikachu Inside

The latest entry in the fan favorite franchise Pokémon saw release earlier this month alongside a particularly interesting controller. Known as the Poké Ball Plus, this controller is able to control Pokémon games that are available on completely separate platforms, as well as transfer data between them. It rumbles, It talks, it lights up, it’s wireless, and [Spawn] uploaded a video that reveals what’s really inside.

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Agilent LCR Meter Teardown

Since 1999, one of the more popular manufacturers of test equipment has been Agilent, the spun-off former instrument division of Hewlett-Packard. From simple multimeters to fully-equipped oscilloscopes, they have been covering every corner of this particular market. And, with the help of [Kerry Wong] and his teardown of an Agilent LCR meter, we can also see that they’ve been making consistent upgrades to their equipment as well.

The particular meter that [Kerry] took apart was an Agilent U1731B, a capable LCR (inductance, capacitance, resistance) meter. He had needed one for himself and noted that while they’re expensive when new, they can be found at a bargain used, but that means dealing with older versions of hardware. For example, his meter uses an 8-bit ADC while the more recent U1733 series uses a 24-bit ADC. The other quality of this meter that [Kerry] made special note of was how densely populated the circuit board is, presumably to save on the design of a VLSI circuit.

While we don’t claim to stump for Agilent in any way, it’s good to know that newer releases of their equipment actually have improved hardware and aren’t just rebadged or firmware-upgraded versions of old hardware with a bigger price tag attached. Also, there wasn’t really any goal that [Kerry] had in mind besides sheer curiosity and a willingness to dive deep into electronics details, as those familiar with his other projects know already.

[Ben Krasnow] Gasses MEMS Chips, for Science

Why in the world does helium kill iPhones and other members of the Apple ecosystem? Enquiring minds want to know, and [Ben Krasnow] has obliged with an investigation of the culprit: the MEMS oscillator. (YouTube, embedded below.)

When we first heard about this, courtesy in part via a Hackaday post on MRI-killed iPhones, we couldn’t imagine how poisoning a micro-electromechanical system (MEMS) part could kill a phone. We’d always associated MEMS with accelerometers and gyros, important sensors in the smartphone suite, but hardly essential. It turns out there’s another MEMS component in many Apple products: an SiT 1532 oscillator, a tiny replacement for quartz crystal oscillators.

[Ben] got a few from DigiKey and put them through some tests in a DIY gas chamber. He found that a partial pressure of helium as low as 2 kPa, or just 2% of atmospheric pressure, can kill the oscillator. To understand why, and because [Ben] has a scanning electron microscope, he lapped down some spare MEMS oscillators to expose their intricate innards. His SEM images are stunning but perplexing, raising questions about how such things could be made which he also addresses.

The bottom line: helium poisons MEMS oscillators in low enough concentrations that the original MRI story is plausible. As a bonus, we now understand MEMS devices a bit better, and have one more reason never to own an iPhone.

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What’s Inside that New Mac Mini Anyway?

It’s been four long years since Apple has refreshed their entry-level desktop line. Those that have been waiting for a redesign of the Mac Mini can now collectively exhale as the Late 2018 edition has officially been released. Thanks to [iFixit] we have a clearer view of what’s changed in the new model as they posted a complete teardown of the Mac Mini over on their website.

Mac Mini Teardown Late 2018 RAM Slots

One of the most welcomed changes is that the DDR4 RAM is actually user upgradeable this time around. Previously RAM was soldered directly to the motherboard, and there were no SO-DIMM slots to speak of. The 2018 Mac Mini’s RAM has also been doubled to 8GB compared to the 4GB in the 2014 model. Storage capacity may have taken a hit in the redesign, but the inclusion of a 128GB PCIe SSD in the base model fairs better than the 500GB HDD of old. The number of ports were flip-flopped between the two model generations with the 2018 Mini featuring four Thunderbolt ports along with two USB 3.0 ports. Though the biggest upgrade lies with the CPU. The base 2018 Mac Mini comes with a 3.6GHz quad-core Intel Core i3 as compared to the 2014’s 1.4GHz dual-core Intel Core i5.

Although Apple lacked “the courage” to drop the 3.5mm headphone jack this time around, they did retain the same footprint for Mac Mini redesign. It still provides HDMI as the default display out port, although the additional Thunderbolt ports provide additional options via an adapter. A quick overview of the spec differences between the 2018 and 2014 base Mac Mini models have been summarized below.

Model 2018 Mac Mini 2014 Mac Mini
CPU 3.6GHz quad-core Intel Core i3 1.4GHz dual-core Intel Core i5
Storage 128GB PCIe SSD 500GB HDD
RAM 8GB DDR4 @ 2666MHz 4GB DDR3 @ 1600MHz
Graphics Intel UHD 630 Intel HD 5000
Ports Thunderbolt 3 (x4), USB 3.0 (x2) Thunderbolt 2 (x2), USB 3.0 (x4)
Card Slot N/A SDXC
WiFi 802.11a/b/g/n/ac 802.11a/b/g/n/ac
Audio 3.5mm Headphone Jack 3.5mm Headphone Jack
Price from $799 from $499

Source [MacWorld]

Fixing a Crazy Expensive Spectrum Analyser, With Solder

It used to be a spectrum analyzer was an exotic piece of gear. However, these days it is pretty common for a scope to have some ability to do the job — that is, plot amplitude versus frequency. However, a dedicated commercial product will usually have a lot more bandwidth and other features. [Signal Path] picked up an Anrtitsu 7.1 GHz portable spectrum analyzer. An expensive bit of kit — anywhere from around $4,000 to $8,000 on eBay — if it is working, but this one was not. It needed power, but it was also missing the internal flash card that the device uses to boot.

Being portable, there’s a lot of digital and RF electronics crammed into a very small space. The initial tear down didn’t look very interesting because it was mostly an RF shield. However, many tiny screws later, you can finally see the actual electronics.

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