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12 Jun 2014

SiT8008-resonatorby zeptobars.ru:

SiTime SiT8008 is a programmable MEMS oscillator reaching quartz precision but with higher reliability and lower g-sensitivity. Also SiTime is one of companies who received investments from Rosnano – Russian high-tech investment fund.

The trick is that to reach maximum Q-factor (up to ~186’000 according to patents) MEMS resonator must operate in vacuum. So they package resonator _inside_ the die in hydrogen atmosphere, then anneal it in vacuum so that hydrogen escapes through silicon. So we see here only a cap with contacts to “buried” MEMS resonator. We were unable to reach the resonator itself without x-ray camera or ion mill.

SiTime SiT8008 – MEMS oscillator : die-shot - [Link]

12 Jun 2014

The WifiDuino is the chip-sized Arduino + Wi-Fi + 128×64 OLED at low price that is easy to use.

WifiDuino is an open-source Arduino-compatible, wifi-enabled board. It allows users to use Arduino IDE (Integrated Development Environment) interface to write programs directly, and with Wi-Fi function. WifiDuino is user friendly, get started in no time. What’s different from Arduino Wi-Fi shield is that WifiDuino is a lot smaller in size, cheaper and easier to use.

WifiDuino is an open source project, which means you are welcome to develop and improve the project if you want. It is also ideal for beginners too. WifiDuino and Arduino are used the same chip. You can quickly learn how to make things with WifiDuino with its rich library resources from the Arduino database.

WifiDuino – The WifiDuino is the chip-sized Arduino + Wi-Fi + 128×64 OLED - [Link]

12 Jun 2014


Stylish and mainly functional are new enclosures from Hammond dedicated for miniature computers..

Credit card-sized miniature computers (SBCs) experience big popularity and they´re quite similar as for th shape and size. Here belong for example Raspberry Pi, BeagleBone black, Arduino Uno, Due, Tre, Mega and Freescale Freedom. They´re used as built-in into a target device but often also as standalone. Just for these purposes are suitable ready-made enclosures designed exactly for a given type.

Despite a similar size of various SBC-s, their physical construction and mainly a position of various connectors are different. That´s why Hammond comes with enclosures designed exactly to fit to a given microcomputer. From several available types, in our store can be fopund types for Raspberry Pi (model B) marked as HAMPIxxx and types for BeagleBone black marked as HAMBONxx. As we might expect, all connectors, expansion slots etc. are easily accessible while maintaining a great mechanical protection of the module itself. Enclosures are constructed to be closed by a “click”, that´s why no tools are necessary to open or close them. Particular details are probably best illustrated on the attached pictures.

Detailed information can be found in the 1593HAMBONE and 1593HAMPI datasheets.

Place your BeagleBone or Raspberry Pi into a stylish enclosure - [Link]

12 Jun 2014


by maximintegrated.com:

The MAX17505 high-efficiency, high-voltage, synchronously rectified step-down converter with dual integrated MOSFETs operates over a 4.5V to 60V input. It delivers up to 1.7A and 0.9V to 90%VIN output voltage. Built-in compensation across the output voltage range eliminates the need for external components. The feedback (FB) regulation accuracy over -40°C to +125°C is ±1.1%. The device is available in a compact (4mm x 4mm) TQFN lead(Pb)-free package with an exposed pad. Simulation models are available.

MAX17505  - Industry’s Only 60V, 1.7A Internal FET Synchronous Buck Converter – [Link]

11 Jun 2014

mjlorton @ youtube.com writes: In this video I go through the components that are part of a solar power solution. I explain the differences between On-grid vs. off grid.

How to Solar Power Your Home / House #1 – On Grid vs Off Grid - [Link]

11 Jun 2014


Juan Ignacio Cerrudo @ ssihla.wordpress.com writes:

The design is based on some of the various diy electronics loads out there (like the one from Dave Jones). The mosfet is a P45N03LT , most likely I took it from some of the PC power supply I’ve “recycled”. I’m using two 25k potentiometers, one for coarse adjustment and the other for fine adjustment (10 turn pots are kind of expensive…). The control voltage varies between 0 and 5 volts and is divided by two with a couple of 10k resistors. The op-amp is an OPA2336, It has rail to rail output so the load can sink roughly up to 2,5. The op amp is powered with a 7805.

Constant Current Electronic Load - [Link]

11 Jun 2014

Dave grabs a few junkbox parts and builds a useful constant current load for switch mode power supply, battery testing, and other applications.

EEVblog #102 – DIY Constant Current Dummy Load for Power Supply and Battery Testing - [Link]

11 Jun 2014


by Benabadji Noureddine:

This Design Idea demonstrates a new method of driving six LEDs with only two I/O lines from a microcontroller, and so is particularly suitable for any pin-limited chip. It uses a pair of I/O lines combined with a pair of complementary bipolar transistors. More than one LED can appear to be lit by multiplexing.

Two PIC pins drive six LEDs - [Link]

11 Jun 2014


Alan Parekh @ hackedgadgets.com writes:

This video was going to be a repair of this Portable USB Charger but as it turns out there wasn’t anything electrically wrong with it. It didn’t work out of the box but I think that must have been caused by some oxidation on the USB contacts. It seems to work like a champ now. The control chip for the DC/DC converter looks to be this DHMF chip. I have never seen the swoop logo before and can’t seem to find any data on this 5 pin device though. It is probably similar to the LT1302 (PDF) that the Adafruit MintyBoost uses. The efficiency of this circuit doesn’t appear to be as efficient as a proper one built using the LT1302 though since when drawing 500mA from the output it can maintain very close to 5 volts out (2.5 watts) but needs an input of 3 volt at 1.3 amps to do it (3.9 watts). This gives us an efficiency of about 64%, the graph from the datasheet of the LT1302 indicates that it could perform at about 86% under these conditions.

Portable USB Charger Teardown - [Link]

11 Jun 2014

PK @ dqydj.net writes:

Let me set this up for you: most 8-bit AVRs in the wild (I happened to use an Arduino Nano for this project) are running at 16 MHz. That’s 16,000,000 calculations per second… a very respectable number for most embedded applications.

The VGA industry standard, which is pretty much the default case “we-can-always-fallback-to-this” video standard (640 pixels wide by 480 pixels tall by 60 frames per second), requires pixels to be clocked out at 25.175 MHz:

25,175,000 > 16,000,000.

And that was just one of the barriers to pulling off this silly project. And, yes, with the hack I told you about last time (Please see my notes below), more is possible without overclocking the Arduino – roughly 800 or so pixels wide in 4 bit color should be doable with a 16MHz part, and, probably 1024 pixels in 4 bit color are in reach for 20 MHz clocked parts. (If you’re willing to drop to 2 or 1 bit color and spend a ton on ICs that can handle even faster clocks, you can hit HD resolutions – but I think you’ll run into financial constraints before you max out on the technical side)

How to Produce 640×480 Color VGA Video From an 8-Bit Arduino - [Link]





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