By Dario Borghino:
Researchers at the University of Toronto have manufactured and tested a new type of colloidal quantum dots (CQD), that, unlike previous attempts, doesn’t lose performance as they keep in contact with oxygen. The development could lead to much cheaper or even spray-on solar cells, as well as better LEDs, lasers and weather satellites.
A quantum dot is a nanocrystal made out of a semicondutor material which is small enough to take advantage of the laws of quantum mechanics. Quantum dots are at the center of a very new and rapidly evolving field of research, with the promise for applications in highly efficient solar cells, transistors and lasers, among other things.
Quantum dot breakthrough could lead to cheap spray-on solar cells - [Link]
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]
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]
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.
Place your BeagleBone or Raspberry Pi into a stylish enclosure - [Link]
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]
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]
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]
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]
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]